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Debt Facilities - Senior Credit Facility (Details)
Aug. 15, 2017
Jan. 06, 2017
EUR (€)
Jan. 06, 2017
USD ($)
Dec. 22, 2016
EUR (€)
Dec. 08, 2015
GBP (£)
Sep. 30, 2017
EUR (€)
Sep. 30, 2017
USD ($)
Jan. 06, 2017
USD ($)
Dec. 08, 2015
USD ($)
Dec. 17, 2014
USD ($)
Senior Credit Facility Member [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 1,500,000,000.0 $ 1,500,000,000.0
Revolving Credit Facility [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                   1,000,000,000.0
Term A Loan Facility Member [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                   $ 500,000,000.0
Term B-1 Loan Facility [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, term         7 years          
USD Term B Loan Facility [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 250,000,000.0  
Sterling Term B Loan Commitment [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Line of Credit Facility, Maximum Borrowing Capacity | £         £ 300,000,000.0          
Term B-2 Loan Commitments [Member]                    
Debt Instrument [Line Items]                    
Loans payable | €           € 995,000,000        
Term B-2 Loan Commitments [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Proceeds from Issuance of Debt   € 1,000,000,000 $ 1,059,800,000 € 1,000,000,000.0            
Unamortized debt issuance expense   € 13,000,000       € 11,600,000 $ 12,200,000 $ 13,800,000    
Percent of original principal, periodic payment   0.25% 0.25%              
Long-term Line of Credit             $ 1,175,600,000      
London Interbank Offered Rate (LIBOR) [Member] | USD Term B Loan Facility [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Basis spread, margin on rate 2.00%     2.50% 3.25%          
Variable rate (percent) 0.00%     0.00% 0.75%          
London Interbank Offered Rate (LIBOR) [Member] | Sterling Term B Loan Commitment [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Basis spread, margin on rate       3.00% 3.75%          
London Interbank Offered Rate (LIBOR) [Member] | Term B-2 Loan Commitments [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Basis spread, margin on rate       2.50%            
Basis spread on variable rate, minimum         0.75%          
London Interbank Offered Rate (LIBOR) [Member] | Euro Term Loan B Loans [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Basis spread, margin on rate 2.50%       3.25%          
Euro Interbank Offered Rate (EURIBOR) [Member] | Term B-2 Loan Commitments [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Variable rate (percent)   3.25% 3.25%              
Base rate [Member] | USD Term B Loan Facility [Member] | Line of Credit [Member]                    
Debt Instrument [Line Items]                    
Basis spread, margin on rate 1.00%     1.50%