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Income Taxes (Details 6) - USD ($) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2012
Income Taxes Additional Disclosures |  |  |  |  |
Unrecognized tax benefits , which if recognized would affect the effective tax rate | $ 12.0 |  | $ 14.6 | $ 11.3 |
Potential interest expense and penalties related to unrecognized tax benefits | 0.2 |  | $ 3.3 | $ 3.4 |
Indemnified assets | $ 5.7 |  |  |  |
Aggregate over assessment on income tax examination |  |  |  |  | $ 0.9
Amount of disallowance of telephone excise tax refund claims for which protests were filed with the Appeals Division of the IRS |  |  |  |  | $ 0.5
Refund of over-assessment received |  | $ 0.9 |  |  |
State income tax returns, period subject to examination, low end of range | 3 years |  |  |  |
State income tax returns, period subject to examination, high end of range | 5 years |  |  |  |
State income tax examination period after formal notification, maximum | 1 year |  |  |  |

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