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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Supplemental Financial Information [Abstract]    
Personnel costs $ 75.6 $ 95.6
Income and other taxes payable 58.5 50.8
Deferred revenue 32.5 57.6
Operating Lease, Liability, Current 11.6 15.7
Accrued interest 18.9 0.0
Other 26.7 30.7
 Accrued liabilities and other $ 223.8 $ 250.4