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Fair Value Information (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of fair value of financial instruments | The following table includes the fair value of our financial instruments for which disclosure of fair value is required (in millions):
|  |  | June 30, 2018 |  | December 31, 2017
| Fair Value Hierarchy Level |  | Carrying Amount |  | Estimated Fair Value |  | Carrying Amount |  | Estimated Fair Value
Assets |  |  |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash | 1 |  | $ | 531.1 |  |  | $ | 531.1 |  |  | $ | 219.7 |  |  | $ | 219.7 |
Liabilities |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | 1 |  | 247.4 |  |  | 256.6 |  |  | 247.1 |  |  | 259.7 |
Senior Secured Term Loan | 2 |  | — |  |  | — |  |  | 333.8 |  |  | 341.1 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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