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 |