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Income Taxes - Net Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards [Line Items] |  |
Document Fiscal Year Focus | 2016 |
Valuation Allowance [Abstract] |  |
Valuation allowance | $ 161.3 | $ 127.4
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset | 161.3 | $ 127.4
Income Tax Credits [Abstract] |  |
Undistributed earnings of foreign subsidiaries | 1,600.0 |
State and Local Jurisdiction |  |
Net Operating Loss Carryforwards [Abstract] |  |
Operating loss carryforwards, subject to expiration | 99.2 |
Foreign Tax Authority |  |
Net Operating Loss Carryforwards [Abstract] |  |
Operating loss carryforwards | 310.0 |
Operating loss carryforwards, subject to expiration | 2.7 |
Operating Loss Carryforwards, Not Subject to Expiration | 307.3 |
United Kingdom |  |
Valuation Allowance [Abstract] |  |
Deferred tax assets, valuation allowance, judgment regarding the realizability of the beginning of the year deferred tax asset | 1.6 |
Domestic Tax Authority |  |
Net Operating Loss Carryforwards [Abstract] |  |
Operating loss carryforwards | 128.0 |
Operating Loss Carryforwards, Subject to Expiration in 1-5 years | 1.1 |
Operating Loss Carryforwards, Subject to Expiration in 5-10 years | 15.8 |
Operating Loss Carryforwards, Subject to Expiration in 10-20 years | 111.1 |
Research Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 11.6 |
Foreign Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 1.4 |
State Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 11.6 |
Tax Year 2016 Through Tax Year 2031 | State Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | 1.4 |
After Tax Year 2031 | State Tax Credit Carryforward |  |
Income Tax Credits [Abstract] |  |
Tax credit carryforward amount | $ 10.2 |

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