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Debt - 2017 Senior Notes (Details) - USD ($) | Feb. 21, 2017 | Dec. 31, 2017
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Term loan A |  |
Debt |  |
Amount of debt redeemed | $ 600,000,000 |
Term loan B |  |
Debt |  |
Amount of debt redeemed | 127,600,000 |
Revolving credit facility |  |
Debt |  |
Amount of debt redeemed | 250,000,000 |
2017 Senior Notes |  |
Debt |  |
Principal amount | $ 1,000,000,000 |
Interest rate (as a percent) | 5.125% |
Fair value of debt instrument |  | $ 1,017,500,000
2017 Senior Notes | Prior to December 15, 2026 |  |
Debt |  |
Redemption price equal to principal amount (in percent) | 100.00% |
2017 Senior Notes | 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 | On or after December 15, 2026 |  |
Debt |  |
Redemption price equal to principal amount (in percent) | 100.00% |

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