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Derivative Instruments (Net Cash Received (Paid) Related to Derivatives) (Schedule) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Operating activities $ (135.5) $ 41.3
Financing activities (7.1) 9.8
Total $ (142.6) $ 51.1