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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 ($)
Aug. 31, 2018
EUR (€)
loan_agreement
Mar. 31, 2020
USD ($)
loan_agreement
Mar. 31, 2019
USD ($)
Apr. 15, 2020
EUR (€)
Apr. 09, 2020
EUR (€)
Mar. 31, 2020
EUR (€)
loan_agreement
Dec. 31, 2019
USD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Oct. 31, 2018
EUR (€)
Oct. 31, 2016
EUR (€)
loan_agreement
Debt Instrument [Line Items]                                
Repayments of Debt           $ 150,300,000 $ 716,700,000                  
Remaining borrowing capacity on line of credit facility           296,000,000.0                    
Number of loan agreements entered | loan_agreement         7                     7
Current portion of long-term debt           1,900,000         $ 2,900,000          
Short-term borrowings           166,200,000         150,500,000          
Outstanding letters of credit           $ 14,400,000         13,900,000          
Credit facility, expires 2023                                
Debt Instrument [Line Items]                                
Remaining borrowing capacity on line of credit facility                     800,000,000.0          
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                        
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           $ 273,900,000         280,200,000          
Debt instrument, face amount | €                           € 250,000,000.0    
Term Loans Due 2019 and 2028                                
Debt Instrument [Line Items]                                
Debt instrument, face amount | €                               € 375,000,000.0
Credit facility, expires 2023                                
Debt Instrument [Line Items]                                
Credit facility           504,000,000.0         0          
Term Loans Due Between 2021 and 2028                                
Debt Instrument [Line Items]                                
Amount borrowed | €         € 338,000,000.0                      
Senior Term Loan Due October 28, 2022                                
Debt Instrument [Line Items]                                
Debt instrument, face amount           164,300,000                 € 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]                                
Senior notes           719,900,000         $ 736,200,000          
Current portion of long-term debt                       $ 61,100,000 € 56,000,000.0      
Senior term loans due between 2021 and 2028 | Term Loan Facility                                
Debt Instrument [Line Items]                                
Senior notes           $ 719,900,000       € 657,000,000.0            
Number of loan agreements entered | loan_agreement           12       12            
Subsequent Event [Member] | Term Loan [Member]                                
Debt Instrument [Line Items]                                
Credit facility $ 261,500,000                              
Repayments of Debt 108,700,000 € 100,000,000.0                            
Subsequent Event [Member] | Multi-Currency Loan, EUR | Term Loan [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, face amount | €                 € 235,000,000.0              
Credit facility | €               € 117,500,000                
Subsequent Event [Member] | Multi-Currency Loan, USD | Term Loan [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, face amount     $ 267,500,000                          
Credit facility $ 133,800,000                              
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member]                                
Debt Instrument [Line Items]                                
Debt instrument, face amount     524,400,000                          
Draw Down, Minimum Principal Amount     100,000,000.0                          
Draw Down, Minimum Integral Multiple Limit     $ 50,000,000.0                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Interest Accrual, Option Two                                
Debt Instrument [Line Items]                                
Margin on variable rate     0.50%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Interest Accrual, Option Three                                
Debt Instrument [Line Items]                                
Margin on variable rate     1.00%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Minimum                                
Debt Instrument [Line Items]                                
Margin on variable rate     1.125%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Minimum | Interest accrual, Option One, Thereafter                                
Debt Instrument [Line Items]                                
Margin on variable rate     1.375%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Minimum | Interest Accrual, Option Three                                
Debt Instrument [Line Items]                                
Margin on variable rate     0.125%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Minimum | Interest Accrual, Option Three, Thereafter                                
Debt Instrument [Line Items]                                
Margin on variable rate     0.375%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Maximum                                
Debt Instrument [Line Items]                                
Margin on variable rate     2.125%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Maximum | Interest accrual, Option One, Thereafter                                
Debt Instrument [Line Items]                                
Margin on variable rate     2.375%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Maximum | Interest Accrual, Option Three                                
Debt Instrument [Line Items]                                
Margin on variable rate     1.375%                          
Subsequent Event [Member] | Incremental Term Loans | Term Loan [Member] | Maximum | Interest Accrual, Option Three, Thereafter                                
Debt Instrument [Line Items]                                
Margin on variable rate     1.375%