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Lease Obligations (Finance Leases) (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Leases [Abstract]          
Finance leases, assets, gross $ 502.0   $ 502.0   $ 463.5
Finance leases, assets, net 387.1   387.1   $ 375.9
Finance leases, assets, depreciation $ 16.8 $ 11.2 $ 32.6 $ 21.2