Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 4.5		$ 5.7		$ 2.6	$ (10.7)
Effective tax rate	136.40%		64.80%		89.70%	148.60%
Tax benefit (reversal) resulting from CARES Act	$ (3.2)	$ 3.2
Tax expense on unrecognized tax benefits	0.4				$ 0.7
Valuation allowance expense	0.4				1.0	$ 0.5
Tax expense relating to foreign tax rate differential			$ 2.2
Transition Tax, tax benefit from the release of an uncertain tax position				$ 20.2
Tax expense, Tax Cuts and Jobs Act				$ 3.6
Transition Tax liability (release)					6.2		$ 20.2
Transition Tax obligation	$ 35.2				$ 35.2