Pension and Other Postretirement Benefit Plans (Details) (USD $) In Millions	0 Months Ended	3 Months Ended		6 Months Ended
	Jul. 15, 2011	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Plans, Defined Benefit [Member]
Components of Net Periodic Benefit Expense [Abstract]
Service Cost		$ 1.9	$ 1.6	$ 3.8	$ 3.1
Interest Cost		6.8	6.5	13.7	13.1
Expected Return on Plan Assets		(8.6)	(8.4)	(17.3)	(16.8)
Amortization of Prior Service Costs		0.1	0.1	0.2	0.2
Amortization of Net Loss		3.0	1.7	6.0	3.3
Amortization of Transition Obligation		0	0	0	0
Net Periodic Benefit Expense		3.2	1.5	6.4	2.9
Amount contributed to benefit plan	0.2			0	0
Expected additional contribution in the current year		2.0		2.0
Other Postretirement Benefit Plans, Defined Benefit [Member]
Components of Net Periodic Benefit Expense [Abstract]
Service Cost		0.9	1.2	1.9	2.4
Interest Cost		2.7	2.8	5.4	5.5
Expected Return on Plan Assets		(2.5)	(2.4)	(4.9)	(4.8)
Amortization of Prior Service Costs		(0.5)	0	(0.9)	0
Amortization of Net Loss		2.2	1.2	4.3	2.4
Amortization of Transition Obligation		0.1	0.6	0.1	1.2
Net Periodic Benefit Expense		2.9	3.4	5.9	6.7
Amount contributed to benefit plan				10.9	2.6
Expected additional contribution in the current year		1.0		1.0
Prescription drug reimbursements received				$ 0.2