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Goodwill and Other Intangibles (Tables)
 12 Months Ended
May. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill
The following table summarizes the activity in Goodwill for the fiscal years ended May 31: 
 
2015
 
2014
Gross beginning balance
$
156.0

 
$
156.0

Accumulated impairment
(34.2
)
 
(20.8
)
Beginning balance
121.8

 
135.2

Impairment charge
(5.4
)
 
(13.4
)
Foreign currency translation
(0.1
)
 
0.0

Gross ending balance
155.9

 
156.0

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

 
$
121.8
Schedule of finite-lived intangible assets
The following table summarizes Other intangibles as of May 31: 
 
2015
 
2014
Other intangibles subject to amortization - beginning balance
$
5.8

 
$
8.0

Additions due to acquisition
0.8

 
—

Amortization expense
(1.9
)
 
(2.0
)
Other
—

 
(0.2
)
Total other intangibles subject to amortization, net accumulated amortization of $17.3 and $15.4, respectively
$
4.7

 
$
5.8

 
 
 
 
Total other intangibles not subject to amortization
$
2.1

 
$
2.2

Total other intangibles
$
6.8

 
$
8.0
Schedule of future amortization of finite-lived intangible assets
The following table reflects the estimated amortization expense for intangibles for the next five fiscal years ending May 31: 
2016
$
1.9

2017
1.9

2018
0.2

2019
0.2

2020
0.1