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Debt Facilities - Mortgage Payable (Details) - Line of Credit [Member]
$ in Millions
Jan. 06, 2017
EUR (€)
Jan. 06, 2017
USD ($)
Dec. 22, 2016
EUR (€)
Dec. 08, 2015
Jun. 30, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Jan. 06, 2017
USD ($)
Term B-2 Loan Commitments [Member]              
Debt Instrument [Line Items]              
Proceeds from Issuance of Debt € 1,000,000,000 $ 1,059.8 € 1,000,000,000.0        
Debt issuance cost € 13,000,000       € 12,100,000 $ 12.8 $ 13.8
Percent of original principal, periodic payment 0.25% 0.25%          
Long-term Line of Credit         € 997,500,000 $ 1,138.7  
London Interbank Offered Rate (LIBOR) [Member] | Term B-2 Loan Commitments [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] | USD Term B Loan Facility [Member]              
Debt Instrument [Line Items]              
Basis spread, margin on rate       3.25%      
Variable rate (percent)     0.00% 0.75%      
London Interbank Offered Rate (LIBOR) [Member] | Sterling Term B Loan Commitment [Member]              
Debt Instrument [Line Items]              
Basis spread, margin on rate     3.00% 3.75%      
Euro Interbank Offered Rate (EURIBOR) [Member] | Term B-2 Loan Commitments [Member]              
Debt Instrument [Line Items]              
Variable rate (percent) 3.25% 3.25%