Financing Arrangements (Tables)

9 Months Ended

Feb. 28, 2013

Financing Arrangements

Summary of carrying amount of debt

	February 28,			May 31,
	2013			2012
Revolving credit facility expiring April 12, 2016 with interest payable monthly	$	305.0		$	280.0
Revolving credit facility (secured by aircraft and related engines and components) due April 23, 2015 with floating interest rate, payable monthly	27.4			33.0
Revolving credit facility subject to annual review in March with interest payable quarterly	0.6			0.6
Note payable due July 19, 2012 with interest at 7.22%, payable monthly	—			8.4
Note payable due March 15, 2014 with floating interest rate, payable monthly	1.6			2.6
Note payable due March 9, 2017 with floating interest rate, payable quarterly	40.0			50.0
Note payable due January 15, 2022 with interest at 7.25%, payable semi-annually on January 15 and July 15	172.2			172.1
Mortgage loan (secured by Wood Dale, Illinois facility) due August 1, 2015 with interest at 5.01%	11.0			11.0
Convertible notes payable due March 1, 2014 with interest at 1.625%, payable semi-annually on March 1 and September 1	65.0			68.5
Convertible notes payable due February 1, 2015 with interest at 1.75%, payable semi-annually on February 1 and August 1	29.3			—
Convertible notes payable due March 1, 2016 with interest at 2.25%, payable semi-annually on March 1 and September 1	43.0			46.1
Convertible notes payable due February 1, 2026 with interest at 1.75%, payable semi-annually on February 1 and August 1	2.7			94.9
Industrial revenue bond (secured by trust indenture on property, plant and equipment) due August 1, 2018 with floating interest rate, payable monthly	25.0			25.0
Total debt	722.8			792.2
Current maturities of debt	(22.2		)	(122.8		)
Long-term debt	$	700.6		$	669.4

Schedule of long-term debt and equity component (recorded in capital surplus, net of income tax benefit) of convertible notes

	February 28,			May 31,
	2013			2012
Long-term debt:
Principal amount	$	150.9		$	229.3
Unamortized discount	(10.9		)	(19.8		)
Net carrying amount	$	140.0		$	209.5
Equity component, net of tax	$	75.3		$	74.8

Schedule of interest expense associated with the convertible notes

	Three Months Ended				Nine Months Ended
	February 28/29,				February 28/29,
	2013		2012		2013		2012
Coupon interest	$	0.8	$	1.3	$	2.8	$	3.7
Amortization of deferred financing fees	0.1		0.2		0.4		0.6
Amortization of discount	2.3		3.3		7.9		9.8
Interest expense related to convertible notes	$	3.2	$	4.8	$	11.1	$	14.1