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Debt - 2017 Senior Notes (Details) - USD ($) | Feb. 21, 2017 | Sep. 30, 2019
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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 |  | $ 1,041,300,000
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 (in percent) | 100.00% |
2017 Senior Notes | At any time and from time to time prior to March 15, 2020 |  |
Debt |  |
Redemption price (in percent) | 105.125% |
Redemption price (as percent of principal) | 35.00% |
2017 Senior Notes | At any time on or after December 15, 2026 |  |
Debt |  |
Redemption price (in percent) | 100.00% |

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