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Supplemental Financial Information (Accrued Liabilities And Other) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Supplemental Financial Information [Abstract]    
Accrued interest $ 100.6 $ 83.1
Personnel costs 82.5 112.0
Deferred revenue 56.9 71.9
Taxes 36.9 46.4
Derivative Liability 10.9 0.4
Other 30.2 12.1
Accrued liabilities and other $ 318.0 $ 325.9