Annual report pursuant to Section 13 and 15(d)

Earnings per Share (Details)

v2.4.0.6
Earnings per Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Income per common share                      
Stock-based awards excluded from the computation of diluted earnings per share (in shares)                 2,000,000 1,900,000 1,800,000
Stock-based awards excluded from the computation of diluted earnings per share as related performance period is not yet complete (in shares)                 1,300,000 1,100,000 1,100,000
Net income basic and diluted $ 24.8 $ 21.3 $ 27.4 $ 31.3 $ 23.5 $ 22.5 $ 33.0 $ 27.1 $ 104.8 $ 106.1 $ 92.3
Weighted-average shares outstanding - basic (in shares)                 62,200,000 62,000,000 61,900,000
Effect of dilutive stock options and unvested time based restricted stock awards                 200,000    
Weighted-average shares outstanding - diluted (in shares)                 62,400,000 62,000,000 61,900,000
Earnings per share - basic and diluted (in dollars per share) $ 0.40 $ 0.34 $ 0.44 $ 0.50 $ 0.38 $ 0.36 $ 0.53 $ 0.44 $ 1.68 $ 1.71 $ 1.49