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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2019
Fair Value Disclosures [Abstract] |
Fair Value of Debt | The fair value of the Company's 2027 Notes, 2022 Notes and 2024 Notes are estimated based on quoted market rates as well as borrowing rates currently available to the Company for loans with similar terms and average maturities (Level 2 inputs) (in millions).
| September 30, 2019 |  | December 31, 2018
| Nominal Unpaid Principal Balance |  | Aggregate Fair Value |  | Nominal Unpaid Principal Balance |  | Aggregate Fair Value
2027 Notes | $ | 1,200.0 |  |  | $ | 1,248.0 |  |  | $ | — |  |  | $ | — |
2022 Notes and 2024 Notes | — |  |  | — |  |  | 864.5 |  |  | 901.2 |

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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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