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Fair Value Information (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Cash, cash equivalents and restricted cash | $ 531.1 | $ 219.7 | $ 154.8 | $ 113.7
Liabilities |  |  |  |
Debt | 250.0 | 589.0 |  |
Level 1 | Carrying Amount |  |  |  |
Assets |  |  |  |
Cash, cash equivalents and restricted cash | 531.1 | 219.7 |  |
Liabilities |  |  |  |
Debt | 247.4 | 247.1 |  |
Level 1 | Estimated Fair Value |  |  |  |
Assets |  |  |  |
Cash, cash equivalents and restricted cash | 531.1 | 219.7 |  |
Liabilities |  |  |  |
Debt | 256.6 | 259.7 |  |
Level 2 | Carrying Amount |  |  |  |
Liabilities |  |  |  |
Debt | 0.0 | 333.8 |  |
Level 2 | Estimated Fair Value |  |  |  |
Liabilities |  |  |  |
Debt | $ 0.0 | $ 341.1 |  |

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