Leases (Schedule Of Lease Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 37.9	$ 33.9
Amortization of right-of-use assets	2.1	2.2
Interest on lease liabilities	0.6	0.7
Total finance lease cost	2.7	2.9
Variable lease cost	10.6	9.5
Total lease cost	$ 51.2	$ 46.3