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