Annual report pursuant to Section 13 and 15(d)

Unaudited Quarterly Financial Information (Details)

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Unaudited Quarterly Financial Information (Details) (USD $)
In Millions, except Per Share data
 3 Months Ended 12 Months Ended
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2009
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Unaudited Quarterly Financial Information                      
Net revenue $ 231.2 $ 211.2 $ 230.0 $ 211.0 $ 212.0 $ 205.8 $ 169.9 $ 161.5 $ 883.4 $ 749.2 $ 649.1
Gross profit 90.7 86.1 101.9 91.2 88.7 75.6 77.0 72.0 369.9 313.3 274.4
Net income $ 23.5 $ 22.5 $ 33.0 $ 27.1 $ 20.1 $ 13.3 $ 29.4 $ 29.5 $ 106.1 $ 92.3 $ 102.3
Earnings per share Basic and diluted (in dollars per share) $ 0.38 $ 0.36 $ 0.53 $ 0.44 $ 0.32 $ 0.22 $ 0.47 $ 0.48 $ 1.71 $ 1.49 $ 1.66