Pension and Post-Retirement Plans (Tables)

6 Months Ended

Jun. 15, 2013

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										24 Weeks Ended
	June 15, 2013					June 16, 2012					June 15, 2013						June 16, 2012
	Pension			Other Post- Retirement Benefits		Pension			Other Post- Retirement Benefits		Pension			Other Post- Retirement Benefits			Pension			Other Post- Retirement Benefits
Estimated return on assets	$	(24.9	)	$	—	$	(23.4	)	$	—	$	(49.8	)	$	—		$	(46.9	)	$	—
Service cost	9.7			0.1		10.3			0.1		19.5			0.3			19.5			0.3
Interest cost	19.7			0.7		21.3			0.8		39.4			1.4			42.6			1.7
Amortization of prior service cost (credit)	3.0			—		3.6			—		5.9			(0.1		)	7.3			(0.1		)
Amortization of unrecognized losses	18.0			0.2		16.7			0.1		35.9			0.5			33.4			0.2
Total	$	25.5		$	1.0	$	28.5		$	1.0	$	50.9		$	2.1		$	55.9		$	2.1