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Airgas Transaction (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Proceeds from sale of Airgas stock   $ 94.7
Net loss on Airgas transaction 0 48.5
Net loss on Airgas transaction, after-tax   31.6
Net loss on Airgas transaction, per share   $ 0.14
Payment of acquisition-related costs   $ 156.2