Leases (Schedule of Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lease, Cost [Abstract]
Operating lease cost	$ 6.4	$ 5.6	$ 6.8
Finance lease cost
Amortization of leased assets	2.4	2.0
Interest on lease liabilities	0.7	0.6
Total finance lease cost	$ 3.1	$ 2.6