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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Accrued interest $ 101.6 $ 83.1
Personnel costs 81.7 112.0
Deferred revenue 76.6 71.9
Taxes 50.8 46.4
Derivative liabilities 6.7 0.4
Other 14.1 12.1
Accrued liabilities and other $ 331.5 $ 325.9