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Indebtedness (Narrative) (Details)
1 Months Ended 9 Months Ended
Oct. 31, 2018
USD ($)
Aug. 31, 2018
EUR (€)
Sep. 30, 2019
USD ($)
loan_agreement
Sep. 30, 2019
EUR (€)
loan_agreement
Dec. 31, 2018
USD ($)
Oct. 31, 2018
EUR (€)
Oct. 31, 2016
EUR (€)
loan_agreement
Dec. 31, 2014
EUR (€)
Debt Instrument [Line Items]                
Debt instrument, unused borrowing capacity | €               € 200,000,000.0
Remaining borrowing capacity on line of credit facility     $ 691,000,000.0          
Number of loan agreements entered | loan_agreement             7  
Current portion of long-term debt     63,600,000   $ 72,600,000      
Short-term borrowings     229,700,000   138,000,000.0      
Outstanding letters of credit     $ 13,900,000   14,100,000      
Credit facility, expires 2023                
Debt Instrument [Line Items]                
Credit facility         114,400,000      
Remaining borrowing capacity on line of credit facility         685,600,000      
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              
1.002% Senior term loan due 2025                
Debt Instrument [Line Items]                
Senior notes     $ 272,600,000   $ 0      
Debt instrument, interest rate, percent     1.002% 1.002% 1.002%      
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     $ 109,000,000.0   $ 114,400,000      
Term Loans Due Between 2021 and 2028                
Debt Instrument [Line Items]                
Amount borrowed | €   € 338,000,000.0            
1.056% Senior term loan due 2020                
Debt Instrument [Line Items]                
Senior notes     $ 218,000,000.0   228,700,000      
Debt instrument, interest rate, percent     1.056% 1.056%       1.056%
Current portion of long-term debt     $ 218,000,000.0   0      
Senior Term Loan Due October 28, 2022                
Debt Instrument [Line Items]                
Debt instrument, face amount     163,500,000     € 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 2019 and 2028                
Debt Instrument [Line Items]                
Senior notes     777,300,000   815,300,000      
Current portion of long-term debt     61,100,000 € 56,000,000.0 $ 63,800,000      
Senior term loans due between 2019 and 2028 | Term Loan Facility                
Debt Instrument [Line Items]                
Senior notes     $ 777,300,000 € 713,000,000.0        
Number of loan agreements entered | loan_agreement     14 14        
Euro Member Countries, Euro | 1.056% Senior term loan due 2020                
Debt Instrument [Line Items]                
Senior notes | €       € 200,000,000.0        
United States of America, Dollars | 1.056% Senior term loan due 2020                
Debt Instrument [Line Items]                
Senior notes     $ 218,000,000.0