Quarterly report pursuant to Section 13 or 15(d)

Segment and Geographical Information (Details 2)

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Segment and Geographical Information (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Reconciles consolidated EBITDA to consolidated net income        
GAAP net income $ 27.4 $ 33.0 $ 58.7 $ 60.1
Interest income (0.1) (3.1) (0.3) (6.4)
Interest expense 2.8 2.9 5.7 5.7
Income tax expense 13.3 17.5 12.0 32.7
Depreciation and amortization 9.5 8.6 21.7 17.3
EBITDA $ 52.9 $ 58.9 $ 97.8 $ 109.4