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Business Segment Information (Details 2) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May. 31, 2015
May. 31, 2014
May. 31, 2013
Reconciliation of segment gross profit to consolidated income before provision for income taxes                      
Segment gross profit $ (20.4) $ 50.1 $ 67.2 $ 62.4 $ 73.5 $ 66.2 $ 77.4 $ 71.8 $ 159.3 $ 288.9 $ 259.5
Selling, general and administrative                 (171.4) (166.3) (164.0)
Earnings from joint ventures                 0.2 3.0 6.7
Loss on extinguishment of debt                 (44.9)   (0.3)
Interest expense                 (26.5) (28.3) (29.1)
Interest income                 0.3 1.5 1.4
Income (Loss) from continuing operations before provision for income taxes                 $ (83.0) $ 98.8 $ 74.2