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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Supplemental Financial Information [Abstract]    
Deferred revenue $ 189.1 $ 197.2
Personnel costs 107.7 161.6
Taxes 71.5 70.8
Interest 32.1 88.4
Derivative Liability 10.9 21.6
Other 13.1 11.3
Accrued liabilities and other $ 424.4 $ 550.9