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Goodwill and Other Intangibles (Tables)
 9 Months Ended
Feb. 29, 2020
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: 
 
February 29, 2020

May 31, 2019

February 28, 2019
Gross beginning balance
$164.8
 
$158.8
 
$158.8
Accumulated impairment
(39.6
)
 
(39.6
)
 
(39.6
)
Beginning balance
$125.2
 
$119.2
 
$119.2
Additions
—

 
6.3

 
—

Foreign currency translation
0.1

 
(0.3
)
 
(0.1
)
Ending balance
$125.3
 
$125.2
 
$119.1
Summary of Activity in Total Other Intangibles for the Periods Indicated
The following table summarizes the activity in other intangibles included in Other assets and deferred charges on the Company’s Financial Statements for the periods indicated:
 
February 29, 2020
 
May 31, 2019
 
February 28, 2019
Beginning balance other intangibles subject to amortization
$12.2
 
$10.1
 
$10.1
Additions
1.6

 
4.5

 
0.6

Amortization expense
(2.4
)
 
(2.8
)
 
(2.0
)
Foreign currency translation
0.1

 
(0.2
)
 
0.0

Other
—

 
0.6

 
—

Total other intangibles subject to amortization, net of accumulated amortization of $29.3, $26.9 and $26.1, respectively
11.5
 
12.2
 
8.7
Total other intangibles not subject to amortization
2.1
 
2.1
 
2.1
Total other intangibles
$13.6
 
$14.3
 
$10.8