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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Supplemental Financial Information [Abstract] |  |
Personnel costs | $ 158.6 | $ 214.0
Deferred revenue | 198.0 | 241.3
Taxes | 60.8 | 97.0
Accrued interest | 75.4 | 83.8
Derivative Liability, Current | 30.7 | 24.1
Other | 11.7 | 36.4
Accrued liabilities and other | $ 535.2 | $ 696.6

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