Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Defered Tax Liabilties, Net	$ 6.5		$ 6.5		$ 5.9
Unrecognized Tax Benefits	24.0		24.0
Unrecognized Tax Benefits, Income Tax Penalties Accrued	3.6		3.6		3.9
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	3.2		3.2		$ 3.0
Unrecognized Tax Benefits, Income Tax Penalties Expense	(0.1)	$ 0.6	0.2	$ 0.5
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 0.2	$ 0.6	0.2	0.6
Unrecognized Tax Benefits, Reductions Resulting from Lapse of Applicable Statute of Limitations			$ 0.8	$ 1.5