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Debt and Capital Lease Obligations (Non-cash Financing Transactions) (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt and Capital Lease Obligations [Abstract]      
Non-cash borrowings and repayments of debt $ 2,583.3 $ 17,104.0 $ 8,939.5