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Leases - (Supplemental balance sheet information related to leases) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Lease right-of-use assets $ 368.8 $ 379.6
Other current lease liabilities 80.8  
Lease liabilities 329.9  
Total $ 410.7 $ 420.3
Weighted-average remaining lease term, years 5 years 8 months 12 days  
Weighted-average discount rate 3.70%