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Supplemental Financial Information (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Supplemental Financial Information [Abstract]    
Derivative instruments $ 22.4 $ 13.6
Currency translation adjustment 7.8 7.6
Other (1.6) (2.2)
Accumulated other comprehensive income $ 28.6 $ 19.0