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Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Valuation Allowance [Abstract] |  |
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset | $ 131.2 | $ 99.7
Amount of change in deferred tax assets valuation allowance | 1.0 |
Income Tax Credits [Abstract] |  |
Undistributed earnings of foreign subsidiaries | 1,400.0 |
State and Local Jurisdiction |  |
Net Operating Loss Carryforwards [Abstract] |  |
Operating loss carryforwards, subject to expiration | 96.6 |
Foreign Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Subject to Expiration in 1-5 years | 0.7 |
Net Operating Loss Carryforwards [Abstract] |  |
Operating loss carryforwards | 379.3 |
Operating Loss Carryforwards, Subject to Expiration in 10-20 years | 1.9 |
Operating Loss Carryforwards, Not Subject to Expiration | 376.7 |
Domestic Tax Authority |  |
Operating Loss Carryforwards [Line Items] |  |
Operating Loss Carryforwards, Subject to Expiration in 1-5 years | 0.0 |
Net Operating Loss Carryforwards [Abstract] |  |
Operating loss carryforwards | 30.8 |
Operating Loss Carryforwards, Subject to Expiration in 5-10 years | 11.9 |
Operating Loss Carryforwards, Subject to Expiration in 10-20 years | 18.9 |
Research Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 18.7 |
Foreign Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 14.6 |
State Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 16.8 |
Tax Year 2019 Through Tax Year 2033 | State Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 2.4 |
After Tax Year 2033 | State Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | $ 14.4 |

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