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Income Taxes (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Unrecognized tax benefits    
Balance as of beginning of period $ 1.9 $ 4.6
Reductions for tax positions of prior years (0.1) 0.0
Reductions relating to settlement and lapse of statute (0.1) (2.7)
Balance as of December 31 $ 1.9 $ 1.9