Leases (Schedule Of Supplemental Balance Sheet Information) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 118.8	$ 117.5
Current operating lease liabilities	31.2	28.6
Non-current operating lease liabilities	95.9	96.2
Total operating lease liabilities	127.1	124.8
Property, at cost	14.6	18.3
Accumulated depreciation and amortization	(8.1)	(9.9)
Net property	6.5	8.4
Current obligations of finance leases	2.3	2.1
Finance leases, net of current obligations	5.7	7.8
Total finance lease liabilities	$ 8.0	$ 9.9
Weighted average remaining lease term, Operating leases	4 years 8 months 12 days	5 years
Weighted average remaining lease term, Finance leases	4 years 4 months 24 days	5 years 1 month 6 days
Weighted average discount rate, Operating leases	2.90%	3.30%
Weighted average discount rate, Finance leases	7.30%	7.00%