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Debt - 2017 Senior Notes (Details) - USD ($)
Feb. 21, 2017
Jun. 30, 2019
Term loan B    
Debt    
Amount of debt redeemed $ 127,600,000  
Term loan A    
Debt    
Amount of debt redeemed 600,000,000  
Revolving credit facility    
Debt    
Amount of debt redeemed 250,000,000  
2017 Senior Notes    
Debt    
Principal amount $ 1,000,000,000  
Fair value of debt instrument   $ 1,035,000,000.0
Interest rate (as a percent) 5.125%  
2017 Senior Notes | At any time and from time to time prior to December 15, 2026    
Debt    
Redemption price equal to principal amount (in percent) 100.00%  
2017 Senior Notes | At any time and from time to time prior to March 15, 2020    
Debt    
Maximum principal amount that can be redeemed using proceeds from equity offerings(in percent) 35.00%  
Redemption price equal to principal using proceeds from equity offerings (in percent) 105.125%  
2017 Senior Notes | At any time on or after December 15, 2026    
Debt    
Redemption price equal to principal amount (in percent) 100.00%