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Supplemental Financial Information (Accrued Liabilities) (Details) - USD ($) $ in Millions | Jun. 30, 2017 | Dec. 31, 2016
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Supplemental Financial Information [Abstract] |  |
Deferred revenue | $ 100.1 | $ 116.7
Accrued interest | 85.2 | 71.7
Personnel costs | 82.1 | 124.0
Taxes | 38.3 | 40.7
Derivative Liability, Current | 1.9 | 12.7
Other | 7.4 | 10.8
Accrued liabilities and other | $ 315.0 | $ 376.6

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