Retirement Plans

9 Months Ended

Feb. 28, 2016

Compensation and Retirement Disclosure [Abstract]

Retirement Plans

Retirement Plans

Components of net periodic benefit cost are as follows:

	Defined Benefit Plans
	Three Months Ended						Nine Months Ended
(in millions)	February 28, 2016			February 22, 2015			February 28, 2016			February 22, 2015
Service cost	$	—		$	0.4		$	—		$	0.9
Interest cost	2.7			2.5			8.0			7.5
Expected return on plan assets	(3.7		)	(3.8		)	(10.9		)	(11.4		)
Recognized net actuarial loss	0.7			0.6			2.1			1.9
Net periodic benefit (credit) cost	$	(0.3	)	$	(0.3	)	$	(0.8	)	$	(1.1	)

	Postretirement Benefit Plan
	Three Months Ended						Nine Months Ended
(in millions)	February 28, 2016			February 22, 2015			February 28, 2016			February 22, 2015
Service cost	$	—		$	0.1		$	0.1		$	0.4
Interest cost	0.2			—			0.6			0.8
Amortization of unrecognized prior service credit	(1.2		)	(1.6		)	(3.6		)	(1.6		)
Recognized net actuarial loss	0.3			0.3			0.9			0.6
Net periodic benefit (credit) cost	$	(0.7	)	$	(1.2	)	$	(2.0	)	$	0.2