Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Aug. 29, 2014	Aug. 23, 2013	Aug. 29, 2014	Aug. 23, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income	$ 0.3		$ 0.8
Other comprehensive income before reclassifications	(2.4)		(1.6)
Amounts reclassified from accumulated other comprehensive income	(1.3)		(2.6)
Total other comprehensive income, net	(3.7)	(0.7)	(4.2)	(3.0)
Accumulated other comprehensive income	(3.4)		(3.4)
Unrealized gain on investments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income	0.9		0.8
Other comprehensive income before reclassifications	(0.1)		0
Amounts reclassified from accumulated other comprehensive income	0		0
Total other comprehensive income, net	(0.1)		0
Accumulated other comprehensive income	0.8		0.8
Pension and other post-retirement liability adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income	18.3		19.6
Other comprehensive income before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	(1.3)		(2.6)
Total other comprehensive income, net	(1.3)		(2.6)
Accumulated other comprehensive income	17.0		17.0
Derivative adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income	(0.1)		(0.1)
Other comprehensive income before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	0		0
Total other comprehensive income, net	0		0
Accumulated other comprehensive income	(0.1)		(0.1)
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated other comprehensive income	(18.8)		(19.5)
Other comprehensive income before reclassifications	(2.3)		(1.6)
Amounts reclassified from accumulated other comprehensive income	0		0
Total other comprehensive income, net	(2.3)		(1.6)
Accumulated other comprehensive income	$ (21.1)		$ (21.1)