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Warranties, Guarantees, and Contingencies (Tables)
12 Months Ended
May 31, 2014
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability
Changes in the warranty reserve for the stated periods were as follows:
(In millions)
 
2014
 
2013
 
2012
Accrual balance, beginning
 
$
24.8

 
$
22.2

 
$
17.0

Accrual for warranty matters
 
20.2

 
23.3

 
24.9

Change in estimate
 

 

 
5.0

Settlements
 
(19.8
)
 
(20.7
)
 
(24.7
)
Accrual balance, ending
 
$
25.2

 
$
24.8

 
$
22.2