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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Supplemental Financial Information [Abstract] |  |
Personnel costs | $ 116.1 | $ 161.6
Deferred revenue | 135.1 | 197.2
Accrued interest | 70.2 | 88.4
Taxes Payable, Current | 65.0 | 70.8
Derivative Liability, Current | 10.7 | 21.6
Other | 11.0 | 11.3
Accrued liabilities and other | $ 408.1 | $ 550.9

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