Leases and Commitments - Income and Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 63.6	$ 66.7
Amortization of right-of-use assets	1.2	1.6
Interest on lease liabilities	0.3	0.3
Short-term leases costs	2.3	3.5
Sublease Income	(15.3)	(12.4)
Net lease cost	$ 52.1	$ 59.7