Quarterly report pursuant to Section 13 or 15(d)

Financing Agreements - Narrative (Details)

v3.21.2
Financing Agreements - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 14, 2021
USD ($)
Mar. 03, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Jun. 16, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 15, 2014
USD ($)
Debt instrument [Line Items]                      
Long-term Debt     $ 1,212,400,000     $ 1,212,400,000   $ 1,552,600,000      
Maximum ratio of Indebtedness to EBITDA allowed       3.50              
Debt Instrument, Covenant Terms, Minimum Ratio of Earnings before Interest, Taxes, Depreciation, and Amortization to Interest Expense       3.00              
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 350,000,000.0   477,700,000   $ 264,900,000 477,700,000 $ 264,900,000 311,800,000   $ 399,400,000  
$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     4,400,000     4,400,000          
Long-term Debt     345,600,000     345,600,000   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         2.59% 2.65% 3.07%        
$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%   2.46%   2.94%        
$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     16,500,000     16,500,000          
Line of credit facility, remaining borrowing capacity     $ 883,500,000     $ 883,500,000          
Weighted average interest rates         2.59% 2.28% 2.78%        
Weighted average facility fee     0.17%   0.30% 0.24% 0.24%        
$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     3,300,000     3,300,000   3,700,000      
Long-term Debt     371,300,000     371,300,000   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     423,300,000     423,300,000   417.2      
Line of credit facility, amount utilized for bank guarantees     260,200,000     260,200,000   261.4      
$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     4,400,000     4,400,000   5,200,000      
Long-term Debt     395,600,000     395,600,000   $ 394,800,000      
Amendment To Credit Agreements                      
Debt instrument [Line Items]                      
Maximum ratio of Indebtedness to EBITDA allowed 3.50                    
Debt Instrument, Covenant Terms, Maximum Ratio of Indebtedness to Earnings before Interest, Taxes, Depreciation, and Amortization, Increase To Ratio 4.00                    
Amendment To Credit Agreements | Base Rate [Member]                      
Debt instrument [Line Items]                      
Debt Instrument, Floor Base Rate 1.00%                    
Amendment To Credit Agreements | London Interbank Offered Rate (LIBOR)                      
Debt instrument [Line Items]                      
Debt Instrument, Floor Base Rate 0.00%                    
L/G Facility Agreement Amendment                      
Debt instrument [Line Items]                      
Maximum ratio of Indebtedness to EBITDA allowed       4.25              
Debt Instrument, Covenant Terms, Minimum Ratio of Earnings before Interest, Taxes, Depreciation, and Amortization to Interest Expense       3.00              
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