Pension and Post-Retirement Plans (Tables)

6 Months Ended

Jun. 14, 2014

Pension and Other Postretirement Benefit Expense [Abstract]

Schedule of components of net pension expense and changes in plan assets and benefit obligations recognized in other comprehensive income

The following tables provide the components of net pension and post-retirement expense (in millions):

	12 Weeks Ended
	June 14, 2014						June 15, 2013
	Pension			Other Post- Retirement Benefits			Pension			Other Post- Retirement Benefits
Estimated return on assets	$	(27.5	)	$	—		$	(24.9	)	$	—
Service cost	9.7			0.2			9.7			0.1
Interest cost	22.3			0.8			19.7			0.7
Amortization of prior service cost (credit)	2.3			(0.1		)	3.0			—
Amortization of unrecognized losses	9.8			0.1			18.0			0.2
Total	$	16.6		$	1.0		$	25.5		$	1.0

	24 Weeks Ended
	June 14, 2014						June 15, 2013
	Pension			Other Post- Retirement Benefits			Pension			Other Post- Retirement Benefits
Estimated return on assets	$	(55.0	)	$	—		$	(49.8	)	$	—
Service cost	19.5			0.4			19.5			0.3
Interest cost	44.5			1.6			39.4			1.4
Amortization of prior service cost (credit)	4.5			(0.1		)	5.9			(0.1		)
Amortization of unrecognized losses	19.6			0.2			35.9			0.5
Total	$	33.1		$	2.1		$	50.9		$	2.1