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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Supplemental Financial Information [Abstract]    
Interest $ 78.0 $ 100.6
Personnel costs 61.9 82.5
Deferred revenue 55.9 56.9
Taxes 50.3 36.9
Operating Lease, Liability, Current 17.9 0.0
Other Accrued Liabilities, Current 15.9 14.3
Derivative Liability 7.2 10.9
Other 15.6 15.9
Accrued liabilities and other $ 302.7 $ 318.0