Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Income before income taxes	$ 74.8	$ 86.1	$ 37.0	$ 114.4
Income tax provision	$ 12.8	$ 24.9	$ 6.1	$ 32.8
Effective tax rate	17.10%	28.90%	16.50%	28.70%
Loss on extinguishment of debt	$ 0.0	$ 0.0	$ 60.6	$ 0.0
Restructuring charges (benefits)	21.6	$ 4.8	40.9	13.7
Unrecognized tax benefits	118.9		118.9
Cost sharing for stock-based compensation				18.2
Reduction of income tax reserves				15.2
Interest				$ 1.7
Maximum
Income Tax Contingency [Line Items]
Unrecognized tax benefits, maximum decrease in the next twelve months	$ 3.5		$ 3.5