Accumulated Other Comprehensive Income (Loss) Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	May 30, 2014	May 24, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income	$ 3.5	$ 1.2
Income tax expense	14.9	4.6
Cost of sales	504.5	457.2
Operating expenses	191.9	185.1
Net income	21.0	13.2
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(1.3)	(0.9)
Unrealized gain on investments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income	0	0.1
Income tax expense	0	0
Net income	0	0.1
Pension and other post-retirement liability adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense	0.9	0.7
Net income	(1.3)	(1.0)
Actuarial Losses (gains) [Member] | Pension and other post-retirement liability adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	0	0.1
Operating expenses	0.1	0.3
Prior Service Cost (Credit) [Member] | Pension and other post-retirement liability adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of sales	(1.1)	(1.0)
Operating expenses	$ (1.2)	$ (1.1)