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Leases (Schedule of Lease-Related Liabilities Recorded on the Balance Sheet) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating lease liabilities:      
Current portion included in accrued liabilities $ 25.9   $ 0.0
Noncurrent operating lease liabilities 240.3 $ 243.9 0.0
Total operating lease liabilities 266.2   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 long-term debt 29.6   28.8
Total financing lease liabilities 30.6   30.8
Total lease liabilities $ 296.8   $ 30.8
Weighted-average remaining lease term, operating leases 14 years    
Weighted-average remaining lease term, finance leases 14 years    
Weighted-average discount rate, operating leases 5.08%    
Weighted-average discount rate, finance leases 5.81%