Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Taxes
Income tax provision (benefit)	$ (1.8)	$ 3.0
Extinguishment of Debt, Gain (Loss), Income Tax	60.0
Foreign Tax Authority
Income Taxes
Income tax provision (benefit)	$ (0.2)	$ (3.3)