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Supplemental Financial Information (Accrued Liabilities And Other) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Supplemental Financial Information [Abstract] |  |
Personnel costs | $ 64.6 | $ 95.6
Deferred revenue | 45.8 | 57.6
Taxes | 45.7 | 50.8
Operating Lease, Liability, Current | 10.0 | 15.7
Accrued interest | 7.6 | 0.0
Other | 22.5 | 30.7
Accrued liabilities and other | $ 196.2 | $ 250.4

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