Acquisition - Pro Forma Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Business Acquisition [Line Items]        
Amortization and depreciation of assets     $ 378.4 $ 364.8
Spine Acquisition [Member]
       
Business Acquisition [Line Items]        
Net sales from Acquiree 17.1   23.2  
Net loss from Acquiree (8.0)   (10.6)  
Pro forma net sales 822.5 791.7 2,417.8 2,333.4
Pro forma net income (loss) (51.0) (307.3) (15.4) (413.0)
Amortization and depreciation of assets   1.2 1.9 3.5
Acquisition-related costs $ 10.4   $ 14.5