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Reconciliation of Net Income (Loss) to Basic and Diluted EPS (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]        
Income from continuing operations $ 117.8 $ 9.6 $ 116.7 $ 12.7
Gain (loss) from discontinued operations and disposal, net of tax (0.3) (26.1) 0.2 (30.2)
Net income (loss) $ 117.5 $ (16.5) $ 116.9 $ (17.5)
Weighted average shares outstanding - Basic 62.5 62.3 62.4 62.2
Dilutive effect of common stock equivalents 0.4 0.3 0.4 0.3
Weighted average shares outstanding - Diluted 62.9 62.6 62.8 62.5
Basic earnings (loss) per share:        
Income from continuing operations $ 1.88 $ 0.15 $ 1.87 $ 0.20
Loss from discontinued operations and disposal, net of tax   $ (0.41)   $ (0.48)
Net earnings (loss) per share $ 1.88 $ (0.26) $ 1.87 $ (0.28)
Diluted earnings (loss) per share:        
Income from continuing operations $ 1.87 $ 0.15 $ 1.86 $ 0.20
Loss from discontinued operations and disposal, net of tax   $ (0.41)   $ (0.48)
Net earnings (loss) per share $ 1.87 $ (0.26) $ 1.86 $ (0.28)