Income Taxes - Narratives (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Provisional tax benefit			$ 46.3
Measurement period adjustment, income tax expense (benefit)		$ (41.8)
Tax benefit from GILTI		55.5
Measurement period adjustment, transition tax expense		13.7
Discontinued operations, deferred tax asset		173.0
Discontinued operations, deferred tax asset, valuation allowance		75.0
Discontinued operations, deferred tax liability		450.0
Accrued deferred tax liability on unrecognized earnings from foreign subsidiaries	$ 12.6
Undistributed earnings of foreign subsidiaries	130.0
Valuation allowance	219.6	475.2
Decrease in valuation allowance	256.0
State operating loss carry forward	161.0
State tax credits	745.0
Foreign operating loss carry forward	201.0
Operating loss carryforward	272.0
Foreign tax credit carryovers	30.2
State tax credits (net of federal tax)	$ 3.8
Tax carry-forward period	10 years
Unrecognized tax benefits	$ 71.2	81.4	90.3	$ 128.3
Unrecognized tax benefits that would impact effective tax rate	71.2
Total unrecognized benefits expected to revers within the next twelve months	4.4
Interest and penalties related to unrecognized tax expense (benefits)	(2.9)	0.4	$ 1.2
Accrued interest and penalties related to unrecognized tax benefits	$ 9.6	$ 12.9