Goodwill and Other Intangibles (Tables)

3 Months Ended

Aug. 31, 2018

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: 

	Three months ended August 31,			Twelve months ended May 31,			Three months ended August 31,
	2018			2018			2017
Gross beginning balance	$	158.8		$	158.5		$	158.5
Accumulated impairment	(39.6		)	(39.6		)	(39.6		)
Beginning balance	$	119.2		$	118.9		$	118.9
Foreign currency translation	(0.1		)	0.2			0.3
Other	—			0.1			—
Ending balance	$	119.1		$	119.2		$	119.2

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:

	Three months ended August 31,			Twelve months ended May 31,			Three months ended August 31,
	2018			2018			2017
Beginning balance other intangibles subject to amortization	$	10.1		$	9.0		$	9.0
Additions	0.5			3.3			0.1
Amortization expense	(0.7		)	(2.1		)	(0.5		)
Foreign currency translation	0.0			(0.1		)	—
Total other intangibles subject to amortization, net of accumulated amortization of $24.8, $24.1 and $22.5, respectively	$	9.9		$	10.1		$	8.6
Total other intangibles not subject to amortization	$	2.1		$	2.1		$	2.1
Total other intangibles	$	12.0		$	12.2		$	10.7