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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2016 | Oct. 01, 2016 | Jul. 02, 2016 | Apr. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating Loss Carryforwards |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, existing income tax expense (benefit) |  |  |  |  | $ 11.8 |  |
Operating loss carryforwards, domestic |  |  |  |  | 27.0 |  |
Operating loss carryforwards, state and local |  |  |  |  | 659.0 |  |
Operating loss carryforwards, foreign |  |  |  |  | 293.0 |  |
Tax credit carryforwards |  |  |  |  | 32.4 |  |
Carryforwards expiring in 2016 |  |  |  |  | 6.8 |  |
Tax credit carryforwards expiring between 2016 and 2035 |  |  |  |  | 714.0 |  |
Increase (decrease) in valuation allowance |  |  |  |  | 35.1 | $ 4.9 |
Unrecognized tax benefit — opening balance |  |  |  | $ 48.8 | 37.9 | 48.8 | $ 63.3
Net unrecognized tax benefits |  |  |  |  | 20.6 | 25.2 | 30.1
Unrecognized tax benefits that would impact the effective tax rate if recognized |  |  |  |  | 15.7 |  |
Gross accrued interest |  |  |  |  | 3.9 | 3.7 | 5.4
Net accrued interest |  |  |  |  | 2.5 | 2.4 | 4.5
Gross interest income included in income tax (provision) benefit |  |  |  |  | (0.2) | 1.8 | 0.2
Penalties excluded |  |  |  |  | 0.0 | 0.0 | 0.0
Income tax expense (benefit) from loss on investment in Foreign Subsidiary |  |  |  |  | (77.6) |  |
Tax benefit related to audit settlements and statute expirations |  |  |  |  | (4.9) | (2.4) | 3.4
Gain on sale of dry cooling business |  |  |  |  | 0.0 | 18.4 | 0.0
Pre-tax losses generated during the year for which no tax benefit was recognized |  |  |  |  |  |  | 139.0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Dry Cooling Business |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  |
Income taxes provided in connection with sale of business |  |  |  |  |  | 0.3 |
Gain on sale of dry cooling business | $ 18.4 | $ 1.7 | $ 1.2 | $ 17.9 |  | 18.4 |
Minimum |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  |
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range |  |  |  |  | 3.0 |  |
Maximum |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  |
Reasonably possible amount that unrecognized tax benefits could decrease within next 12 months, low end of range |  |  |  |  | 15.0 |  |
Foreign Jurisdictions |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  |  |  |  |
Foreign losses generated for which no tax benefit was recognized |  |  |  |  | $ 68.2 | $ 13.7 |
Foreign taxes incurred related to Spin-Off and reorganization actions |  |  |  |  |  |  | $ 3.7

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- Definition Represents the net (net of applicable income tax effect) amount of interest expense accrued as of the date of statement of financial position for underpayment of income taxes, computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity. + References No definition available. + Details
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