Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

v3.20.4
Financing Agreements - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Rate
Dec. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Nov. 21, 2019
USD ($)
Debt instrument [Line Items]        
Long-term Debt $ 1,396,400,000   $ 1,552,600,000  
Maximum ratio of Indebtedness to EBITDA allowed     4.75  
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 1,200,000 $ 1,300,000    
Debt instrument, face amount 500,000,000.0      
Long-term Debt $ 467,500,000   $ 473,700,000  
Weighted average interest rates 2.75% 3.49%    
HI_225TermLoan [Member]        
Debt instrument [Line Items]        
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 3,600,000   3,700,000  
Debt instrument, face amount 225,000,000.0      
Long-term Debt 0   213,400,000  
$900.0 revolving credit facility (excluding outstanding letters of credit)        
Debt instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 829,600,000      
Long-term Debt 63,000,000.0   0  
Letters of Credit Outstanding, Amount 7,400,000      
Line of credit facility, remaining borrowing capacity $ 829,600,000      
Weighted average interest rates 2.52% 3.13%    
Weighted average facility fee 0.30% 0.17%    
Senior Notes [Member]        
Debt instrument [Line Items]        
Debt Issuance Costs, Line of Credit Arrangements, Gross $ 5,000,000.0   5,200,000  
Debt instrument, face amount 400,000,000.0      
Long-term Debt 370,900,000   370,800,000  
$150 senior unsecured notes [Member]        
Debt instrument [Line Items]        
Debt Issuance Costs, Line of Credit Arrangements, Gross     300,000  
Debt instrument, face amount 375,000,000.0      
$100.0 Series A Notes (5)        
Debt instrument [Line Items]        
Debt Issuance Costs, Line of Credit Arrangements, Gross 200,000   300,000  
Long-term Debt 99,800,000   $ 99,700,000  
Other Financing Agreements        
Debt instrument [Line Items]        
Line of credit facility, maximum borrowing capacity 437,800,000      
Line of credit facility, amount utilized for bank guarantees 264,900,000      
Term Loan 225 Million [Member] | Term Loan [Member]        
Debt instrument [Line Items]        
Debt instrument, face amount 225,000,000.0     $ 225,000,000.0
Debt Instrument, Redemption, Period One [Member] | HI_500TermLoan [Member]        
Debt instrument [Line Items]        
Debt Instrument, Periodic Payment, Principal 0.05      
Debt Instrument, Redemption, Period Three [Member] | HI_500TermLoan [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] | Maximum | HI_500TermLoan [Member]        
Debt instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate | Rate 1.375%      
LIBO Rate [Member] | Minimum | HI_500TermLoan [Member]        
Debt instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate | Rate 1.00%      
LIBO Rate [Member] | Maximum | HI_500TermLoan [Member]        
Debt instrument [Line Items]        
Debt Instrument, Basis Spread on Variable Rate | Rate 2.375%      
Molding Technology Solutions | 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