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Goodwill and Other Intangibles (Tables)
 3 Months Ended
Aug. 31, 2019
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: 
 
August 31, 2019
 
May 31, 2019
 
August 31, 2018
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
(0.2
)
 
(0.3
)
 
(0.1
)
Ending balance
$125.0
 
$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 Condensed Consolidated Balance Sheets for the periods indicated:
 
August 31, 2019
 
May 31, 2019
 
August 31, 2018
Beginning balance other intangibles subject to amortization
$12.2
 
$10.1
 
$10.1
Additions
—

 
4.5

 
0.5

Amortization expense
(0.8
)
 
(2.8
)
 
(0.7
)
Foreign currency translation
(0.2
)
 
(0.2
)
 
0.0

Other
—

 
0.6

 
—

Total other intangibles subject to amortization, net of accumulated amortization of $27.7, $26.9 and $24.8, respectively
$11.2
 
$12.2
 
$9.9
Total other intangibles not subject to amortization
$2.1
 
$2.1
 
$2.1
Total other intangibles
$13.3
 
$14.3
 
$12.0