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Goodwill and Other Intangibles (Tables)
 6 Months Ended
Nov. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Activity in Goodwill for the Periods Indicated
The following table summarizes the activity in Goodwill for the periods indicated: 
 
Six months ended 
 November 30, 2015
 
Twelve months ended
May 31, 2015
 
Six months ended 
 November 30, 2014
Gross beginning balance
$
155.9

 
$
156.0

 
$
156.0

Accumulated impairment
(39.6
)
 
(34.2
)
 
(34.2
)
Beginning balance
$
116.3

 
$
121.8

 
$
121.8

Impairment charge
—

 
(5.4
)
 
—

Foreign currency translation
(0.1
)
 
(0.1
)
 
0.0

Gross ending balance
$
155.8

 
$
155.9

 
$
156.0

Accumulated impairment
(39.6
)
 
(39.6
)
 
(34.2
)
Ending balance
$
116.2

 
$
116.3

 
$
121.8
Summary of Activity in Total Other Intangibles for the Periods Indicated
The following table summarizes the activity in Total other intangibles for the periods indicated:
 
Six months ended 
 November 30, 2015
 
Twelve months ended
May 31, 2015
 
Six months ended 
 November 30, 2014
Beginning balance - Other intangibles subject to amortization
$
4.7

 
$
5.8

 
$
5.8

Additions
2.4

 
0.8

 
0.8

Amortization expense
(1.1
)
 
(1.9
)
 
(1.0
)
Total other intangibles subject to amortization,
  net of accumulated amortization of $18.4, $17.3
    and $16.3, respectively
$
6.0

 
$
4.7

 
$
5.6

Total other intangibles not subject to
  amortization
$
2.1

 
$
2.1

 
$
2.1

Total other intangibles
$
8.1

 
$
6.8

 
$
7.7