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Basic and Diluted Shares Reconciliation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Earnings Per Share [Abstract]                      
Net income $ (9.7) $ 29.1 $ 26.6 $ 30.1 $ 16.5 $ 27.7 $ 21.0 $ 14.6 $ 76.1 $ 79.8 $ 92.6
Less: Dividends paid to participating securities                 (0.2) (0.2) (0.1)
Less: Undistributed earnings available to participating securities                 (0.4) (0.9) (1.1)
Undistributed and distributed earnings available to common stockholders                 $ 75.5 $ 78.7 $ 91.4
Common Stock, Number of Shares, Par Value and Other Disclosures [Abstract]                      
Average number of common shares outstanding (shares)                 31,056,700 30,986,200 33,230,200
Effect of dilutive stock-based compensation (shares)                 181,600 355,700 256,600
Average number of common and potential common shares outstanding (shares)                 31,238,300 31,341,900 33,486,800