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Business Segment Information (Details 2) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2012 | Nov. 30, 2011 | Nov. 30, 2012 | Nov. 30, 2011
Reconciliation of segment gross profit to consolidated income before provision for income taxes |  |  |  |
Segment gross profit | $ 87.4 | $ 78.6 | $ 177.7 | $ 154.3
Selling, general and administrative | (50.8) | (44.6) | (104.1) | (87.7)
Earnings from joint ventures | 1.2 | 0.3 | 2.6 | 0.5
Loss on extinguishment of debt | (0.1) |  | (0.3) |
Interest expense | (10.8) | (7.8) | (21.4) | (15.3)
Interest income | 0.3 | 0.3 | 0.7 | 0.4
Income before provision for income taxes | $ 27.2 | $ 26.8 | $ 55.2 | $ 52.2

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