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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Supplemental Financial Information [Abstract]    
Personnel costs $ 80.9 $ 134.4
Income and other taxes payable 52.7 61.2
Deferred revenue 38.9 30.0
Operating Lease, Liability, Current 15.6 21.1
Accrued interest 0.0 115.2
Other Accrued Liabilities, Current 0.0 20.3
Other 19.2 35.5
 Accrued liabilities and other $ 207.3 $ 417.7