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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Fair Value of Debt | The fair value of debt is 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).
| June 30, 2017 |  | December 31, 2016
| Nominal Unpaid Principal Balance |  | Aggregate Fair Value |  | Nominal Unpaid Principal Balance |  | Aggregate Fair Value
Debt | $ | 2,179.1 |  |  | $ | 2,237.5 |  |  | $ | 2,215.3 |  |  | $ | 2,275.5 |

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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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