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Leases (Maturities of Operating and Financing Lease Obligation Under Topic 840) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Operating leases    
2019 $ 126.6 $ 123.9
2020   85.4
2021   66.6
2022   54.3
2023   46.8
Thereafter   178.6
Total payments   555.6
Finance leases    
2019   101.4
2020   107.3
2021   96.7
2022   94.5
2023   93.5
Thereafter   464.0
Total payments   957.4
Amounts representing interest   (336.1)
Total finance leases   621.3
Current portion   78.2
Noncurrent portion   $ 543.1