Leases Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of Lease Expense [Abstract]
Operating Lease, Expense	$ 93.6	$ 109.0	$ 123.2
Finance Lease, Right-of-Use Asset, Amortization	1.5	0.7	0.0
Finance Lease, Interest Expense	0.5	0.4	0.0
Variable Lease, Cost	$ 8.0	$ 13.2	$ 0.0