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Leases (Schedule of Lease-Related Liabilities Recorded on the Balance Sheet) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating lease liabilities:
Current portion included in accrued liabilities	$ 25.5		$ 0.0
Noncurrent operating lease liabilities	235.2	$ 241.0	0.0
Total operating lease liabilities	260.7		0.0
Financing lease liabilities:
Current portion included in Current maturities of long-term debt	1.0		2.0
Long-term portion of lease liabilities in other debt	29.9		28.8
Total financing lease liabilities	30.9		30.8
Total lease liabilities	$ 291.6		$ 30.8
Weighted-average remaining lease term, operating leases	13 years
Weighted-average remaining lease term, finance leases	14 years
Weighted-average discount rate, operating leases	5.07%
Weighted-average discount rate, finance leases	5.81%

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