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Indebtedness (Narrative) (Details)
1 Months Ended 3 Months Ended
Apr. 15, 2020
USD ($)
Apr. 15, 2020
EUR (€)
Apr. 09, 2020
USD ($)
Oct. 31, 2018
USD ($)
Aug. 31, 2018
EUR (€)
loan_agreement
Mar. 31, 2021
USD ($)
loan_agreement
Mar. 31, 2020
USD ($)
Mar. 31, 2021
EUR (€)
loan_agreement
Feb. 16, 2021
USD ($)
Feb. 16, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Apr. 15, 2020
EUR (€)
Apr. 09, 2020
EUR (€)
Oct. 31, 2019
USD ($)
loan_agreement
Oct. 31, 2019
EUR (€)
loan_agreement
Jan. 25, 2019
EUR (€)
Oct. 31, 2018
EUR (€)
Oct. 31, 2016
EUR (€)
loan_agreement
Debt Instrument [Line Items]                                    
Repayments of Debt           $ 416,800,000 $ 150,300,000                      
Number of loan agreements entered | loan_agreement         7                 2 2     7
Current portion of long-term debt           311,900,000         $ 325,900,000              
Short-term borrowings           51,800,000         33,800,000              
Outstanding letters of credit           14,600,000         14,400,000              
Credit facility, expires 2023                                    
Debt Instrument [Line Items]                                    
Remaining borrowing capacity on line of credit facility           800,000,000.0         800,000,000.0              
Credit facility, expires 2023                                    
Debt Instrument [Line Items]                                    
Credit facility           $ 0         277,900,000              
Credit Facility | Interest Accrual, Option Two                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       0.50%                            
Credit Facility | Interest Accrual, Option Three                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       1.00%                            
Credit Facility | Minimum                                    
Debt Instrument [Line Items]                                    
Margin on variable rate           0.70%                        
Credit Facility | Minimum | Variable Basis, Additional Margin                                    
Debt Instrument [Line Items]                                    
Margin on variable rate           0.70%                        
Credit Facility | Minimum | Interest Accrual, Option One                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       0.875%                            
Credit Facility | Minimum | Interest Accrual, Option Three | Variable Basis, Additional Margin                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       0.00%                            
Credit Facility | Maximum                                    
Debt Instrument [Line Items]                                    
Margin on variable rate           2.26%                        
Credit Facility | Maximum | Variable Basis, Additional Margin                                    
Debt Instrument [Line Items]                                    
Margin on variable rate           1.25%                        
Credit Facility | Maximum | Interest Accrual, Option One                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       1.875%                            
Credit Facility | Maximum | Interest Accrual, Option Three | Variable Basis, Additional Margin                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       0.875%                            
Credit Facility | Credit facility, expires 2023                                    
Debt Instrument [Line Items]                                    
Maximum borrowing capacity on line of credit facility       $ 800,000,000.0                            
Credit facility, expires 2023 | Credit facility, expires 2023                                    
Debt Instrument [Line Items]                                    
Line of Credit Facility, Fair Value of Amount Outstanding           $ 0         0              
Term Loan [Member]                                    
Debt Instrument [Line Items]                                    
Credit facility                 $ 276,000,000.0                  
Repayments of Debt $ 108,700,000 € 100,000,000.0                                
Remaining borrowing capacity on line of credit facility           271,600,000                        
Senior Notes Due 2025, 1.002%                                    
Debt Instrument [Line Items]                                    
Debt instrument, interest rate, percent                               1.002%    
1.002% Senior term loan due 2025                                    
Debt Instrument [Line Items]                                    
Senior notes           293,400,000         306,700,000              
Debt instrument, face amount | €                               € 250,000,000.0    
Term Loans Due Between 2021 and 2028                                    
Debt Instrument [Line Items]                                    
Senior notes           $ 771,100,000         $ 806,000,000.0              
Debt instrument, face amount | €                                   € 375,000,000.0
Amount borrowed | €         € 338,000,000.0                          
Number of loan agreements entered | loan_agreement           12   12                    
Senior Term Loan Due October 28, 2022                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount           $ 176,100,000                     € 150,000,000.0  
Senior Term Loan Due October 28, 2022 | Minimum                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       0.875%                            
Senior Term Loan Due October 28, 2022 | Maximum                                    
Debt Instrument [Line Items]                                    
Margin on variable rate       1.875%                            
Senior term loans due between 2021 and 2028                                    
Debt Instrument [Line Items]                                    
Current portion of long-term debt                           $ 61,100,000 € 56,000,000.0      
Multi-Currency Loan, EUR | Term Loan [Member]                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount | €                         € 235,000,000.0          
Credit facility | €               € 117,500,000   € 117,500,000   € 117,500,000            
Multi-Currency Loan, USD | Term Loan [Member]                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount     $ 267,500,000                              
Credit facility $ 133,800,000               $ 133,800,000                  
Remaining borrowing capacity on line of credit facility           133,700,000                        
Incremental Term Loans | Term Loan [Member]                                    
Debt Instrument [Line Items]                                    
Debt instrument, face amount           543,300,000                        
Draw Down, Minimum Principal Amount     100,000,000.0                              
Draw Down, Minimum Integral Multiple Limit     $ 50,000,000.0                              
Incremental Term Loans | Term Loan [Member] | Interest Accrual, Option Two                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     0.50%                              
Incremental Term Loans | Term Loan [Member] | Interest Accrual, Option Three                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     1.00%                              
Incremental Term Loans | Term Loan [Member] | Minimum                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     1.125%                              
Incremental Term Loans | Term Loan [Member] | Minimum | Interest accrual, Option One, Thereafter                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     1.375%                              
Incremental Term Loans | Term Loan [Member] | Minimum | Interest Accrual, Option Three                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     0.125%                              
Incremental Term Loans | Term Loan [Member] | Minimum | Interest Accrual, Option Three, Thereafter                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     0.375%                              
Incremental Term Loans | Term Loan [Member] | Maximum                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     2.125%                              
Incremental Term Loans | Term Loan [Member] | Maximum | Interest accrual, Option One, Thereafter                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     2.375%                              
Incremental Term Loans | Term Loan [Member] | Maximum | Interest Accrual, Option Three                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     1.375%                              
Incremental Term Loans | Term Loan [Member] | Maximum | Interest Accrual, Option Three, Thereafter                                    
Debt Instrument [Line Items]                                    
Margin on variable rate     1.375%                              
Senior term loans due between 2021 and 2028 | Term Loan Facility                                    
Debt Instrument [Line Items]                                    
Senior notes           $ 771,100,000   € 657,000,000.0