Leases Lease cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 0.6	$ 0.7
Finance Lease, Interest Expense	0.2	0.3
Operating Lease, Cost, Variable Leases	53.3	59.7
Lease, Cost, Excluding Sublease Income	$ 54.1	$ 60.7