Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at beginning of year	$ 47.6	$ 41.9	$ 38.9
Additions based on tax positions relating to the current year	6.1	7.4	7.0
Reductions based on expiration of statute of limitations	(10.3)	(6.2)	(5.2)
Additions/(Subtractions) to tax positions relating to previous years	(2.2)
Additions/(Subtractions) to tax positions relating to previous years		4.5	1.6
Settlements	0.0	0.0	(0.4)
TOTAL UNRECOGNIZED TAX BENEFITS	$ 41.2	$ 47.6	$ 41.9