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Other Income, Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | May 23, 2012
Other Income and Expenses [Abstract] |  |  |  |  |
Interest income | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.1 |
Realized gain on investments | 0.8 | 0.1 | 2.2 | 0.4 |
Loss on extinguishment of debt | 0.0 | 0.0 | 0.0 | (11.1) |
All other income (expense), net | 0.7 | (0.1) | 0.9 | 0.2 |
Other income (expense), net | $ 1.5 | $ 0.0 | $ 3.1 | (10.4) |
Senior Notes | Senior Notes Due 2020 |  |  |  |  |
Debt Instrument |  |  |  |  |
Debt instrument contractual rate (percent) |  |  |  |  | 8.25%
Redemption premium |  |  |  | 8.2 |
Write off of deferred debt issuance cost |  |  |  | $ 2.9 |

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