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Debt - Additional Information (Details)
€ in Millions
1 Months Ended 12 Months Ended
Apr. 25, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2018
EUR (€)
May 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2018
Debt Instrument [Line Items]                
Commercial paper         $ 76,000,000 $ 34,000,000    
Proceeds from divestiture of businesses   $ 993,600,000     993,600,000 0 $ 0  
Long-term debt         787,600,000 1,440,700,000    
Loss on early extinguishment of debt         17,100,000 101,400,000 $ 0  
Other Credit Facilities                
Debt Instrument [Line Items]                
Credit facility maximum borrowing capacity         21,100,000.0      
Line of credit facility, amount outstanding         0      
Line of Credit | Revolving credit facilities                
Debt Instrument [Line Items]                
Debt term 5 years              
Credit facility maximum borrowing capacity $ 800,000,000.0              
Line of credit increase limit $ 300,000,000.0              
Remaining borrowing capacity         697,800,000      
Line of Credit | Revolving credit facilities | Minimum                
Debt Instrument [Line Items]                
Covenant, unrestricted cash         $ 5,000,000.0      
Leverage ratio covenant         3.75      
EBITDA ratio covenant         1.00      
Line of Credit | Revolving credit facilities | Maximum                
Debt Instrument [Line Items]                
Covenant, unrestricted cash         $ 250,000,000.0      
Leverage ratio covenant         1.00      
EBITDA ratio covenant         3.00      
Senior Notes                
Debt Instrument [Line Items]                
Repayments of debt       $ 1,659,300,000        
Loss on early extinguishment of debt       $ (6,500,000)        
Senior Notes | Senior notes 2.900% due 2018                
Debt Instrument [Line Items]                
Long-term debt           $ 255,300,000    
Debt, interest rate               2.90%
Senior Notes | Senior Notes 2.450% due 2019                
Debt Instrument [Line Items]                
Debt, interest rate               2.45%
Cash tender offer | €     € 363.4          
Loss on extinguishment of debt, before write off of debt issuance cost   16,000,000            
Write off of deferred debt issuance cost   $ 1,100,000            
Senior Notes | Senior Notes Maturing In 2019                
Debt Instrument [Line Items]                
Long-term debt         $ 405,100,000