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Leases (Lease Expense and Cash Outflows from Operating and Finance Leases) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Finance lease expense:  
Depreciation and amortization $ 84.2
Interest expense 33.8
Total finance lease expense 118.0
Operating lease expense 135.7
Short-term lease expense 8.0
Variable lease expense 4.8
Total lease expense 266.5
Cash paid for amounts included in the measurement of lease liabilities:  
Operating cash outflows from operating leases 135.5
Operating cash outflows from finance leases 33.8
Financing cash outflows from finance leases 60.0
Total cash outflows from operating and finance leases $ 229.3