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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