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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Supplemental Financial Information [Abstract]    
Deferred revenue $ 109.8 $ 116.7
Personnel costs 93.3 124.0
Taxes 44.0 40.7
Interest 78.2 71.7
Derivative Liability 6.7 12.7
Other 11.2 10.8
Accrued liabilities and other $ 343.2 $ 376.6