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Business Segment Information - Recon of Gross Profit to Income (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
May 31, 2016
Feb. 29, 2016
Nov. 30, 2015
Aug. 31, 2015
May 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May 31, 2016
May 31, 2015
May 31, 2014
Reconciliation of segment gross profit to income from continuing operations before provision for income taxes                      
Segment gross profit $ 64.2 $ 58.3 $ 59.9 $ 54.5 $ (20.4) $ 50.1 $ 67.2 $ 62.4 $ 236.9 $ 159.3 $ 288.9
Selling, general and administrative                 (170.8) (171.4) (166.3)
Earnings (Loss) from joint ventures                 (0.3) 0.2 3.0
Loss on extinguishment of debt         $ (44.9)       (0.4) (44.9)  
Interest expense                 (6.4) (26.5) (28.3)
Interest income                 0.3 0.3 1.5
Income (Loss) from continuing operations before provision for income taxes                 $ 59.3 $ (83.0) $ 98.8