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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Supplemental Financial Information [Abstract] |  |
Personnel costs | $ 95.2 | $ 112.0
Deferred revenue | 78.0 | 71.9
Interest | 75.0 | 83.1
Taxes | 58.2 | 46.4
Other | 15.4 | 12.5
Accrued liabilities and other | $ 321.8 | $ 325.9

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