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Supplemental Financial Information (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Derivative instruments $ 14.7 $ 22.5
Currency translation adjustment 7.5 7.8
Other (1.7) (1.7)
Accumulated other comprehensive income $ 20.5 $ 28.6