Other Comprehensive Income or Loss (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 14, 2014	Jun. 15, 2013
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (271.1)	$ (73.8)
Other comprehensive income (loss) before reclassifications	3.2	(29.7)
Amounts reclassified from accumulated other comprehensive income	24.1	49.4
Tax expense	(9.6)	(18.6)
Total comprehensive income including noncontrolling interests	17.7	1.1
Distribution of Blackhawk	2.2
Ending balance	(251.2)	(72.7)
Pension and Post-Retirement Benefit Plan Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(130.7)	(472.3)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	24.1	49.4
Tax expense	(9.4)	(18.2)
Total comprehensive income including noncontrolling interests	14.7	31.2
Distribution of Blackhawk	0
Ending balance	(116.0)	(441.1)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(138.8)	399.0
Other comprehensive income (loss) before reclassifications	2.1	(29.8)
Amounts reclassified from accumulated other comprehensive income	0	0
Tax expense	0	0
Total comprehensive income including noncontrolling interests	2.1	(29.8)
Distribution of Blackhawk	2.2
Ending balance	(134.5)	369.2
Other
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1.6)	(0.5)
Other comprehensive income (loss) before reclassifications	1.1	0.1
Amounts reclassified from accumulated other comprehensive income	0	0
Tax expense	(0.2)	(0.4)
Total comprehensive income including noncontrolling interests	0.9	(0.3)
Distribution of Blackhawk	0
Ending balance	$ (0.7)	$ (0.8)