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Supplemental Financial Information (Accrued Liabilities And Other) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Supplemental Financial Information [Abstract]    
Personnel costs $ 124.0 $ 161.6
Deferred revenue 116.7 197.2
Accrued interest 71.7 88.4
Taxes 40.7 70.8
Derivative Liability 12.7 21.6
Other 10.8 11.3
Accrued liabilities and other $ 376.6 $ 550.9