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Computation of Earnings (Loss) Per Common Share (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]                      
Income (loss) income from continuing operations $ 4.9 $ 4.4 $ 9.6 $ 3.1 $ 6.5 $ 3.3 $ 5.7 $ (2.4) $ 22.0 $ 13.1 $ (74.1)
Loss from discontinued operations and disposal, net of tax                 (49.5) (27.3) (101.6)
Net loss $ 4.8 $ (14.7) $ (16.5) $ (1.1) $ (15.2) $ 2.4 $ 4.4 $ (5.8) $ (27.5) $ (14.2) $ (175.7)
Weighted average shares outstanding - basic                 62.3 62.2 57.6
Dilutive effect of common stock equivalents                 0.4    
Weighted average shares outstanding - diluted                 62.7 62.2 57.6
Basic and diluted earnings (loss) per share:                      
Income from continuing operations                 $ 0.35 $ 0.21 $ (1.29)
Loss from discontinued operations and disposal, net of tax                 $ (0.79) $ (0.44) $ (1.76)
Loss per share                 $ (0.44) $ (0.23) $ (3.05)