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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Operating lease cost [1] $ 69.0 $ 93.0
Amortization of leased assets 17.0 18.0
Interest on lease liabilities 7.0 9.0
Lease, Cost 93.0 120.0
Short-term operating lease cost 0.0 0.2
Variable operating lease cost $ 1.8 $ 1.9
[1] Includes short-term lease costs of $0.0 million and $0.2 million for the three months ended March 31, 2020, and 2019, respectively, and variable lease costs of $1.8 million and $1.9 million for the three months ended March 31, 2020, and 2019,