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Debt - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Aug. 17, 2018
Sep. 16, 2014
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Oct. 15, 2016
Oct. 14, 2014
Debt Instrument [Line Items]                  
Debt issuance costs, gross     $ 41,300,000   $ 41,300,000   $ 41,300,000    
Accumulated amortization, debt issuance costs     15,200,000   15,200,000   12,800,000    
Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Debt instrument, term   5 years              
Line of Credit | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Revolving credit facility, maximum borrowing capacity $ 750,000,000.0                
Revolving credit facility, Euro or Sterling sublimit $ 100,000,000.0                
Average outstanding amount     150,000,000.0 $ 371,900,000 75,200,000 $ 211,200,000      
Long-term debt and capital lease obligations, gross     90,000,000.0   90,000,000.0   0    
Term Loan Facilities | Three year term loan facility                  
Debt Instrument [Line Items]                  
Debt instrument, term 3 years                
Long-term debt and capital lease obligations, gross     $ 300,000,000.0   $ 300,000,000.0   300,000,000.0    
Annual interest rate on loan facility     3.30%   3.30%        
Term Loan Facilities | Five year term loan facility                  
Debt Instrument [Line Items]                  
Debt instrument, term 5 years                
Long-term debt and capital lease obligations, gross     $ 281,300,000   $ 281,300,000   288,800,000    
Annual interest rate on loan facility     3.43%   3.43%        
Credit Facilities                  
Debt Instrument [Line Items]                  
Maximum ratio of indebtedness to EBITDA   375.00%              
Minimum ratio of EBITDA to Interest expense   300.00%              
Credit Facilities | Maximum                  
Debt Instrument [Line Items]                  
Maximum aggregate principal amount of accelerated maturity of other indebtedness allowed   $ 75,000,000.0              
Senior Notes | 3.30% senior notes, due 2019                  
Debt Instrument [Line Items]                  
Long-term debt and capital lease obligations, gross     $ 0   $ 0   250,000,000.0    
Interest rate     3.30%   3.30%     3.80% 3.30%
Senior Notes | 4.50% senior notes, due 2024                  
Debt Instrument [Line Items]                  
Long-term debt and capital lease obligations, gross     $ 500,000,000.0   $ 500,000,000.0   500,000,000.0    
Interest rate     4.50%   4.50%     5.00% 4.50%
Senior Notes | Senior Notes Due in 2026                  
Debt Instrument [Line Items]                  
Long-term debt and capital lease obligations, gross     $ 500,000,000.0   $ 500,000,000.0   500,000,000.0    
Interest rate     5.875%   5.875%        
Senior Notes | 4.875% senior notes, due 2027                  
Debt Instrument [Line Items]                  
Long-term debt and capital lease obligations, gross     $ 600,000,000.0   $ 600,000,000.0   600,000,000.0    
Interest rate     4.875%   4.875%        
Senior Notes | 5.250% Senior Notes, Due 2029                  
Debt Instrument [Line Items]                  
Long-term debt and capital lease obligations, gross     $ 500,000,000.0   $ 500,000,000.0   $ 500,000,000.0    
Interest rate     5.25%   5.25%