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Leases (Lease Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Operating lease cost [1] $ 68.0 $ 85.0 $ 137.0 $ 178.0
Amortization of leased assets 17.0 18.0 34.0 36.0
Interest on lease liabilities 7.0 8.0 14.0 17.0
Lease, Cost 92.0 111.0 185.0 231.0
Short-term operating lease cost 0.6 0.2 0.8 0.4
Variable operating lease cost $ 1.4 $ 2.1 $ 3.2 $ 4.0
[1] Includes short-term lease costs of $0.6 million and $0.2 million for the three months ended June 30, 2020, and 2019, respectively, and $0.8 million and $0.4 million for the six months ended June 30, 2020, and 2019, respectively, and variable lease costs of $1.4 million and $2.1 million for the three months ended June 30, 2020, and 2019, respectively, and $3.2 million and $4.0 million for the six months ended June 30, 2020, and 2019, respectively.