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Leases (Lease Balances) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
ROU assets recorded during the period associated with:      
Finance leases $ 441.8   $ 531.0
Operating leases 337.8   512.7
Total ROU assets 779.6   1,043.7
Lease liabilities:      
Finance lease 514.4   617.1
Operating leases 352.5   545.1
Total lease liabilities $ 866.9   $ 1,162.2
Weighted average remaining lease term for finance leases 23 years 1 month 6 days    
Weighted average discount rate, for finance leases 6.00%    
ROU assets associated with finance leases $ 17.2 $ 32.6  
Weighted average remaining lease term for operating leases 7 years 7 months 6 days    
Weighted average discount rate, for operating leases 3.60%    
Addition to ROU assets associated with operating leases $ 53.2 $ 30.6