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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 7.8 $ 0.2
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 26,000,000 26,000,000
Common stock, shares issued 21,291,000 21,225,000