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Fair Value Measurements - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value Measurements      
Change in fair value of contingent consideration liabilities $ (4,218) $ 206 $ 454
Credit Agreement      
Fair Value Measurements      
Borrowings under credit agreement, carrying value 2,000,000 2,100,000  
Receivables securitization      
Fair Value Measurements      
Borrowings under receivable securitization facility, carrying value 100,000 100,000  
Senior Notes      
Fair Value Measurements      
Debt instrument, fair value 615,000 599,000  
Debt instrument, face amount   600,000  
Euro Notes [Member]      
Fair Value Measurements      
Debt instrument, fair value 658,000 561,000  
Debt instrument, face amount 600,150 525,850  
Fair Value, Measurements, Recurring [Member]      
Fair Value Measurements      
Assets, Fair Value Disclosure 70,590 54,038  
Financial and Nonfinancial Liabilities, Fair Value Disclosure 111,327 43,155  
Fair Value, Measurements, Recurring [Member] | Cash Surrender Value [Member]      
Fair Value Measurements      
Assets, Fair Value Disclosure 45,984 36,131  
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]      
Fair Value Measurements      
Assets, Fair Value Disclosure 19,102 16,421  
Fair Value, Measurements, Recurring [Member] | Cross Currency Swap      
Fair Value Measurements      
Assets, Fair Value Disclosure 5,504 1,486  
Financial and Nonfinancial Liabilities, Fair Value Disclosure   3,128  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]      
Fair Value Measurements      
Assets, Fair Value Disclosure 70,590 54,038  
Financial and Nonfinancial Liabilities, Fair Value Disclosure 108,691 39,993  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Surrender Value [Member]      
Fair Value Measurements      
Assets, Fair Value Disclosure 45,984 36,131  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]      
Fair Value Measurements      
Assets, Fair Value Disclosure 19,102 16,421  
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Swap      
Fair Value Measurements      
Assets, Fair Value Disclosure 5,504 1,486  
Financial and Nonfinancial Liabilities, Fair Value Disclosure $ 61,492 $ 3,128