Pension and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Net periodic pension costs under retirement plans and other post-retirement benefits

The net periodic pension costs under retirement plans and other postretirement benefits were as follows:

	Thirteen Weeks Ended March 31, 2012
	Canada plans			U.S. plans		U.K. plan			MCI		Consolidated
	(In millions)
Defined Benefit Plans
Service cost	$	4.1		$	—	$	—		$	0.1	$	4.2
Interest cost	16.6			—		24.5			—		41.1
Expected return on plan assets	(15.3		)	—		(28.2		)	—		(43.5		)
Amortization of prior service cost	0.2			—		—			—		0.2
Amortization of net actuarial loss	5.4			—		4.4			—		9.8
Less expected participant contributions	(0.4		)	—		—			—		(0.4		)
Net periodic pension cost (benefit)	$	10.6		$	—	$	0.7		$	0.1	$	11.4
Other Postretirement Benefits
Service cost—benefits earned during the period	$	0.6		$	0.1	$	—		$	—	$	0.7
Interest cost on projected benefit obligation	2.0			—		—			—		2.0
Amortization of prior service cost (gain)	(0.9		)	—		—			—		(0.9		)
Amortization of net actuarial loss (gain)	(0.1		)	—		—			—		(0.1		)
Net periodic postretirement benefit cost	$	1.6		$	0.1	$	—		$	—	$	1.7

	Thirteen Weeks Ended March 26, 2011
	Canada plans			U.S. plans		U.K. plan			MCI		Consolidated
	(In millions)
Defined Benefit Plans
Service cost	$	4.7		$	—	$	—		$	—	$	4.7
Interest cost	18.1			0.1		26.9			—		45.1
Expected return on plan assets	(18.6		)	—		(31.2		)	—		(49.8		)
Amortization of prior service cost	0.2			—		—			—		0.2
Amortization of net actuarial loss	2.3			—		2.7			—		5.0
Less expected participant contributions	(0.4		)	—		—			—		(0.4		)
Special termination of benefits	—			—		—			—		—
Net periodic pension cost (benefit)	$	6.3		$	0.1	$	(1.6	)	$	—	$	4.8
Other Postretirement Benefits
Service cost—benefits earned during the period	$	0.5		$	0.1	$	—		—		$	0.6
Interest cost on projected benefit obligation	1.9			—		—			—		1.9
Amortization of prior service cost (gain)	(0.9		)	—		—			—		(0.9		)
Amortization of net actuarial loss	(0.9		)	—		—			—		(0.9		)
Net periodic postretirement benefit cost	$	0.6		$	0.1	$	—		$	—	$	0.7