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Net Income Per Share (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Net income per share        
Net income, as reported, for basic net income per share $ 20.1 $ 21.7 $ 39.7 $ 41.6
Plus: interest expense on convertible debt, net of tax 1.1 1.1 2.1 2.1
Net income for diluted net income per share $ 21.2 $ 22.8 $ 41.8 $ 43.7
Weighted average common shares outstanding 33.6 33.3 33.5 33.2
Assumed stock options exercised and awards vested, based on the treasury stock method 0.5 0.5 0.5 0.5
Assumed conversion of convertible debt, based on the if-converted method 2.9 2.9 2.9 2.9
Weighted average shares assuming dilution 37.0 36.7 36.9 36.6
Antidilutive options excluded from computation of diluted net income per share 1.0 1.3 1.2 1.0