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Debt - 2027 Notes (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from the issuance of senior notes |  |  | $ 0 | $ 744,700,000 | $ 0
Loss on extinguishment of debt |  | $ (21,200,000) | 0 | 21,200,000 | 0
Debt issuance costs |  |  | $ 0 | $ 11,900,000 | $ 0
Senior Notes | 2027 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, aggregate principal amount | $ 750,000,000.0 |  |  |  |
Stated interest rate | 3.80% |  | 3.80% |  |
Percentage of par | 99.294% |  |  |  |
Debt interest rate, effective percentage | 3.885% |  | 3.885% | 3.885% |
Proceeds from the issuance of senior notes | $ 744,700,000 |  |  |  |
Debt issuance costs | 6,000,000 |  |  |  |
Senior Notes | 2027 Notes | Prior to June 15, 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of par |  |  | 100.00% |  |
Senior Notes | 2027 Notes | On or After June 15, 2027 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage of par |  |  | 100.00% |  |
Senior Notes | 2023 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, aggregate principal amount | $ 500,000,000.0 |  |  |  |
Percentage of par | 100.00% |  |  |  |
Make-whole premium | $ 17,000,000 |  |  |  |
Loss on extinguishment of debt | 21,200,000 |  |  |  |
Credit Agreement | Prior Term Loan Facility | Term Loan Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt, aggregate principal amount | $ 500,000,000.0 |  |  |  |

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