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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Supplemental Financial Information [Abstract]    
Personnel costs $ 104.2 $ 161.6
Deferred revenue 172.9 197.2
Taxes 79.6 70.8
Accrued interest 74.3 88.4
Derivative Liability, Current 14.9 21.6
Other 12.6 11.3
Accrued liabilities and other $ 458.5 $ 550.9