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Leases - (Supplemental balance sheet information related to leases) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Jan. 01, 2019
Lease right-of-use assets $ 384.5 $ 379.6
Other current lease liabilities 82.6  
Lease liabilities 335.3  
Total $ 417.9 $ 420.3
Weighted-average remaining lease term, years 5 years 4 months 24 days  
Weighted-average discount rate 3.80%