Quarterly report pursuant to Section 13 or 15(d)

Business Segment Information (Details)

v3.7.0.1
Business Segment Information (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May 31, 2017
May 31, 2017
May 31, 2016
Feb. 28, 2017
Cost of product sold        
Net gain (loss) on undesignated commodity derivative contracts   $ 1.6 $ 2.6  
Total cost of product sold   (940.2) (990.5)  
Selling, general and administrative expenses        
Costs associated with the Canadian Divestiture and related activities $ (15.2) (3.2)   $ (12.0)
Total selling, general and administrative expenses   (427.2) (328.6)  
Comparable Adjustments [Member]        
Cost of product sold        
Flow through of inventory step-up   (7.0) (8.1)  
Amortization of favorable interim supply agreement   0.0 (2.2)  
Total cost of product sold   (7.7) 11.1  
Selling, general and administrative expenses        
Impairment of intangible assets   (86.8) 0.0  
Costs associated with the Canadian Divestiture and related activities   (3.2) (3.7)  
Transaction, integration and other acquisition-related costs   (1.6) (2.3)  
Other losses   (1.4) (1.1)  
Total selling, general and administrative expenses   (93.0) (7.1)  
Comparable Adjustments, Operating income (loss)   (100.7) 4.0  
Comparable Adjustments [Member] | Commodity derivative contracts [Member]        
Cost of product sold        
Net gain (loss) on undesignated commodity derivative contracts   (3.1) 13.1  
Settlements of undesignated commodity derivative contracts   $ 2.4 $ 8.3