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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]        
Income from continuing operations $ 17.0 $ 117.8 $ 24.6 $ 116.7
Gain (loss) from discontinued operations and disposal, net of tax 0.1 (0.3) (0.1) 0.2
Net income $ 17.1 $ 117.5 $ 24.5 $ 116.9 [1]
Weighted average shares outstanding - Basic (shares) 62.8 62.5 62.8 62.4
Dilutive effect of common stock equivalents (shares) 1.0 0.4 1.0 0.4
Weighted average shares outstanding - Diluted (shares) 63.8 62.9 63.8 62.8
Basic earnings (loss) per share:        
Earnings from continuing operations (usd per share) $ 0.27 $ 1.88 $ 0.39 $ 1.87
Loss from discontinued operations and disposal, net of tax (usd per share) $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net earnings (loss) per share (usd per share) $ 0.27 $ 1.88 $ 0.39 $ 1.87
Diluted earnings (loss) per share:        
Earnings from continuing operations (usd per share) $ 0.27 $ 1.87 $ 0.39 $ 1.86
Loss from discontinued operations and disposal, net of tax (usd per share) $ 0.00 $ 0.00 $ 0.00 $ 0.00
Net earnings (loss) per share (usd per share) $ 0.27 $ 1.87 $ 0.39 $ 1.86
[1] The change in actuarial losses in the three and six months ended June 30, 2014 includes $1.4 million and $2.7 million of actuarial losses that have been included in the computation of net postretirement pension expense for the period.