Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

v3.21.1
Financing Agreements - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 03, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
Mar. 31, 2021
USD ($)
Mar. 31, 2020
Sep. 30, 2020
USD ($)
Jun. 16, 2020
USD ($)
Dec. 15, 2014
USD ($)
Debt instrument [Line Items]                
Long-term Debt   $ 1,211,900,000   $ 1,211,900,000   $ 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           3.00    
$350.0 senior unsecured notes (4)                
Debt instrument [Line Items]                
Debt instrument, face amount $ 350,000,000.0              
Debt interest rate 3.75%              
Deferred financing costs $ 4,500,000              
Debt redemption price 101.00%              
Debt Issuance Costs, Line of Credit Arrangements, Gross   4,500,000   4,500,000        
Long-term Debt   345,500,000   345,500,000   $ 0    
$500.0 term loan (1)                
Debt instrument [Line Items]                
Debt instrument, face amount   500,000,000.0   500,000,000.0        
Repayments of term loans       500,000,000.0        
Debt Issuance Costs, Line of Credit Arrangements, Gross   1,300,000   1,300,000        
Long-term Debt   $ 0   $ 0   473,700,000    
Weighted average interest rates   2.51%   2.65%        
$225.0 term loan (5)                
Debt instrument [Line Items]                
Debt instrument, face amount   $ 225,000,000.0   $ 225,000,000.0        
Repayments of term loans       225,000,000.0        
Debt Issuance Costs, Line of Credit Arrangements, Gross           300,000    
Long-term Debt   $ 0   0   213,400,000    
Weighted average interest rates   2.63%            
$900.0 revolving credit facility (excluding outstanding letters of credit)                
Debt instrument [Line Items]                
Long-term Debt   $ 0   0   0    
Letters of Credit Outstanding, Amount   7,400,000   7,400,000        
Line of credit facility, remaining borrowing capacity   $ 892,600,000   $ 892,600,000        
Weighted average interest rates   2.21% 2.84% 2.28% 2.88%      
Weighted average facility fee   0.24% 0.25% 0.27% 0.21%      
$375.0 senior unsecured notes, net of discount (3)                
Debt instrument [Line Items]                
Debt instrument, face amount   $ 375,000,000.0   $ 375,000,000.0        
Debt Issuance Costs, Line of Credit Arrangements, Gross   3,400,000   3,400,000   3,700,000    
Long-term Debt   371,100,000   371,100,000   370,800,000    
$100.0 Series A Notes (6)                
Debt instrument [Line Items]                
Debt instrument, face amount               $ 100,000,000.0
Debt interest rate               4.60%
Debt Issuance Costs, Line of Credit Arrangements, Gross   200,000   200,000   300,000    
Long-term Debt   99,800,000   99,800,000   99,700,000    
Other Financing Agreements                
Debt instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   418,700,000   418,700,000        
Line of credit facility, amount utilized for bank guarantees   208,300,000   208,300,000        
$400.0 senior unsecured notes (2)                
Debt instrument [Line Items]                
Debt instrument, face amount             $ 400,000,000.0  
Debt Issuance Costs, Line of Credit Arrangements, Gross   4,700,000   4,700,000   5,200,000    
Long-term Debt   395,300,000   395,300,000   $ 394,800,000    
Debt Instrument, Redemption, Period One | $350.0 senior unsecured notes (4)                
Debt instrument [Line Items]                
Debt redemption price 101.875%              
Debt Instrument, Redemption, Period Two | $350.0 senior unsecured notes (4)                
Debt instrument [Line Items]                
Debt redemption price 101.25%              
Debt Instrument, Redemption, Period Three | $350.0 senior unsecured notes (4)                
Debt instrument [Line Items]                
Debt redemption price 100.625%              
Debt Instrument, Redemption, Period Four | $350.0 senior unsecured notes (4)                
Debt instrument [Line Items]                
Debt redemption price 100.00%              
Debt Instrument, Redemption, Period Five | $350.0 senior unsecured notes (4)                
Debt instrument [Line Items]                
Debt redemption price 103.75%              
Amount of debt available to be redeemed 40.00%              
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   $ 650,000,000.0