Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

v3.19.3.a.u2
Financing Agreements - Narrative (Details)
€ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
USD ($)
Rate
Dec. 31, 2018
Mar. 31, 2020
Sep. 30, 2019
USD ($)
Jan. 10, 2020
EUR (€)
Dec. 31, 2019
EUR (€)
Debt instrument [Line Items]                    
Debt Instrument, Covenant Holiday, Maximum Ratio of Indebtedness to Earnings before Interest, Taxes, Depreciation, and Amortization               4.0    
Debt Issuance Costs, Line of Credit Arrangements, Gross         $ 2,000,000.0          
Long-term Debt         1,864,700,000     $ 619,500,000    
Maximum ratio of Indebtedness to EBITDA allowed               3.5    
LeverageHolidayBusinessAcquisition               75,000,000.0    
Debt Instrument, Covenant Terms, Minimum Ratio of Earnings before Interest, Taxes, Depreciation, and Amortization to Interest Expense               3.0    
HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Issuance Costs, Line of Credit Arrangements, Gross         1,500,000          
Debt instrument, face amount         500,000,000.0          
Long-term Debt         $ 492,200,000     $ 0    
Weighted average interest rates         3.49%          
HI_225TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Issuance Costs, Line of Credit Arrangements, Gross         $ 500,000          
Debt instrument, face amount         225,000,000.0          
Long-term Debt         $ 221,700,000     0    
Weighted average interest rates         3.37%          
$900.0 revolving credit facility (excluding outstanding letters of credit)                    
Debt instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity         $ 361,500,000          
Long-term Debt         525,000,000.0     0    
Letters of Credit Outstanding, Amount         8,300,000          
Line of credit facility, remaining borrowing capacity         $ 366,700,000          
Weighted average interest rates         3.13% 2.37%        
Weighted average facility fee         0.17% 0.11%        
$150.0 senior unsecured notes, net of discount (4)                    
Debt instrument [Line Items]                    
Debt Issuance Costs, Line of Credit Arrangements, Gross         $ 4,200,000     4,300,000    
Debt instrument, face amount         375,000,000.0          
Long-term Debt         370,200,000     370,100,000    
$150 senior unsecured notes [Member]                    
Debt instrument [Line Items]                    
Debt Issuance Costs, Line of Credit Arrangements, Gross         100,000     200,000    
Debt instrument, face amount         150,000,000.0          
Long-term Debt         149,800,000     149,700,000    
$100.0 Series A Notes (5)                    
Debt instrument [Line Items]                    
Debt Issuance Costs, Line of Credit Arrangements, Gross         300,000     300,000    
Long-term Debt         99,700,000     $ 99,700,000    
Other Financing Agreements                    
Debt instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity         344,200,000          
Line of credit facility, amount utilized for bank guarantees         249,300,000          
Syndicated credit facility                    
Debt instrument [Line Items]                    
Line of credit facility, maximum borrowing capacity | €                   € 150.0
Debt Instrument, Redemption, Period One [Member] | HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Periodic Payment, Principal         0.05          
Debt Instrument, Redemption, Period One [Member] | HI_225TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Periodic Payment, Principal         0.05          
Debt Instrument, Redemption, Period Three [Member] | HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Periodic Payment, Principal         0.075          
Debt Instrument, Redemption, Period Three [Member] | HI_225TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Periodic Payment, Principal         0.075          
Debt Instrument, Redemption, Period Five [Member] | HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Periodic Payment, Principal         $ 0.10          
Base Rate [Member] | Minimum | HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         0.00%          
Base Rate [Member] | Minimum | HI_225TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         0.00%          
Base Rate [Member] | Maximum | HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         0.875%          
Base Rate [Member] | Maximum | HI_225TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         0.75%          
LIBO Rate [Member] | Minimum | HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         1.00%          
LIBO Rate [Member] | Minimum | HI_225TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         0.875%          
LIBO Rate [Member] | Maximum | HI_500TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         1.875%          
LIBO Rate [Member] | Maximum | HI_225TermLoan [Member]                    
Debt instrument [Line Items]                    
Debt Instrument, Basis Spread on Variable Rate | Rate         1.75%          
Subsequent Event [Member] | L/G Facility Agreement Amendment                    
Debt instrument [Line Items]                    
Line of credit facility, increase in maximum borrowing capacity | €                 € 25.0  
Milacron | Revolver [Member] | $900.0 revolving credit facility (excluding outstanding letters of credit)                    
Debt instrument [Line Items]                    
Long-term Line of Credit         $ 650,000,000.0          
Forecast [Member] | Amendment Of Credit Agreement, L/G Facility Agreement And The Shelf Agreement [Member]                    
Debt instrument [Line Items]                    
Maximum ratio of Indebtedness to EBITDA allowed 3.50 3.75 4.00 4.25     4.50