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Leases (Lease Expense and Cash Outflows from Operating and Finance Leases) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Finance lease expense:    
Depreciation and amortization $ 19.8 $ 21.7
Interest expense 8.6 8.1
Total finance lease expense 28.4 29.8
Operating lease expense 64.6 35.8
Short-term lease expense 2.2 1.8
Variable lease expense 1.5 1.3
Total lease expense 96.7 68.7
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash outflows from operating leases 80.4 38.9
Operating cash outflows from finance leases 8.6 8.1
Financing cash outflows from finance leases 18.3 39.2
Total cash outflows from operating and finance leases $ 107.3 $ 86.2