Other Comprehensive Income or Loss (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 15, 2013	Jun. 16, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (73.8)	$ (61.5)
Other comprehensive income before reclassifications	(29.7)	(13.6)
Amounts reclassified from accumulated other comprehensive income	49.4	45.3
Tax expense	(18.6)	(17.2)
Total comprehensive income including noncontrolling interests	1.1	14.5
Ending balance	(72.7)	(47.0)
Pension and Post-Retirement Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(472.3)	(462.1)
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	49.4	45.3
Tax expense	(18.2)	(17.0)
Total comprehensive income including noncontrolling interests	31.2	28.3
Ending balance	(441.1)	(433.8)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	399.0	402.1
Other comprehensive income before reclassifications	(29.8)	(14.4)
Amounts reclassified from accumulated other comprehensive income	0	0
Tax expense	0	0
Total comprehensive income including noncontrolling interests	(29.8)	(14.4)
Ending balance	369.2	387.7
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(0.5)	(1.5)
Other comprehensive income before reclassifications	0.1	0.8
Amounts reclassified from accumulated other comprehensive income	0	0
Tax expense	(0.4)	(0.2)
Total comprehensive income including noncontrolling interests	(0.3)	0.6
Ending balance	$ (0.8)	$ (0.9)