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Supplemental Financial Information (Accrued Liabilities And Other) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Supplemental Financial Information [Abstract] |  |
Personnel costs | $ 95.6 | $ 134.4
Accrued interest | 0.0 | 115.2
Taxes | 50.8 | 61.2
Deferred revenue | 57.6 | 30.0
Operating Lease, Liability, Current | 15.7 | 21.1
Other | 30.7 | 35.5
Accrued liabilities and other | 250.4 | 417.7
Settlement Liabilities, Current | $ 0.0 | $ 20.3

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