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Income Taxes - Changes in Deferred Tax Assets (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Net operating loss tax carryovers | $ 357.0 | $ 336.1
Tax credits | 62.4 | 92.6
Gross deferred income tax assets | 733.6 | 742.9
Valuation allowance | (264.7) | (274.0)
Total deferred income tax assets | 468.9 | $ 468.9
Change |  |
Tax Credit Carryforward [Line Items] |  |
Net operating loss tax carryovers | 20.9 |
Tax credits | (30.2) |
Gross deferred income tax assets | (9.3) |
Valuation allowance | 9.3 |
Total deferred income tax assets | $ 0.0 |

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