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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Supplemental Financial Information [Abstract]    
Personnel costs $ 116.1 $ 161.6
Deferred revenue 135.1 197.2
Accrued interest 70.2 88.4
Taxes Payable, Current 65.0 70.8
Derivative Liability, Current 10.7 21.6
Other 11.0 11.3
Accrued liabilities and other $ 408.1 $ 550.9