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Derivative Instruments (Net Cash Received (Paid) Related to Derivatives) (Schedule) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Operating activities $ 34.3 $ 101.4
Investing activities 0.0 (0.5)
Financing activities 46.6 (139.9)
Total $ 80.9 $ (39.0)