Leases (Schedule of Lease-Related Liabilities Recorded on the Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Operating lease liabilities:
Current portion included in accrued liabilities	$ 25.4	$ 25.2
Noncurrent operating lease liabilities	231.3	238.5
Total operating lease liabilities	256.7	263.7
Finance lease liabilities:
Current portion included in current maturities of long-term debt	1.1	1.1
Long-term portion of lease liabilities in long-term debt	29.2	29.5
Total financing lease liabilities	30.3	30.6
Total lease liabilities	$ 287.0	$ 294.3
Weighted-average remaining lease term, operating leases	13 years
Weighted-average remaining lease term, finance leases	13 years
Weighted-average discount rate, operating leases	5.05%
Weighted-average discount rate, finance leases	5.81%