Financing Arrangements (Tables)

9 Months Ended

Feb. 29, 2016

Financing Arrangements

Summary of carrying amount of debt

	February 29,			May 31,
	2016			2015
Revolving Credit Facility expiring March 24, 2020 with interest payable monthly	$	135.0		$	50.0
Industrial revenue bond (secured by property, plant and equipment) due August 1, 2018 with interest payable monthly	25.0			25.0
Note payable due March 9, 2017 with floating interest rate, payable semi-annually on June 1 and December 1	10.0			20.0
Convertible notes payable due March 1, 2016 with interest at 2.25% payable semi-annually on March 1 and September 1	25.7			48.0
Mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015	—			11.0
Total debt	195.7			154.0
Current maturities of debt	(35.7		)	(69.0		)
Long-term debt	$	160.0		$	85.0

Schedule of interest expense associated with the convertible notes

	Three Months Ended				Nine Months Ended
	February 29/28,				February 29/28,
	2016		2015		2016		2015
Coupon interest	$	0.2	$	0.3	$	0.6	$	1.2
Amortization of deferred financing fees	—		—		—		0.1
Amortization of discount	0.3		0.4		1.3		1.7
Interest expense related to convertible notes	$	0.5	$	0.7	$	1.9	$	3.0