Accumulated Other Comprehensive Income (Loss) Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 26, 2016	Aug. 28, 2015	Aug. 26, 2016	Aug. 28, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	$ (37.2)		$ (39.6)
Other comprehensive income (loss) before reclassifications	0.0		3.4
Amounts reclassified from accumulated other comprehensive income (loss)	(1.7)		(2.7)
Net current period other comprehensive income (loss)	(1.7)	$ (4.6)	0.7	$ (9.3)
Accumulated other comprehensive loss	(38.9)		(38.9)
Cost of sales	494.9	547.9	979.7	1,032.9
Operating expenses	200.9	199.7	397.0	384.8
Income tax expense	21.4	21.3	33.7	32.8
Net income	38.2	37.2	57.6	57.2
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(1.7)	(1.2)	(2.7)	(2.3)
Unrealized gain (loss) on investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	0.5		0.6
Other comprehensive income (loss) before reclassifications	0.0		(0.1)
Amounts reclassified from accumulated other comprehensive income (loss)	0.0		0.0
Net current period other comprehensive income (loss)	0.0		(0.1)
Accumulated other comprehensive loss	0.5		0.5
Pension and other post-retirement liability adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	8.8		10.7
Other comprehensive income (loss) before reclassifications	1.1		0.2
Amounts reclassified from accumulated other comprehensive income (loss)	(1.7)		(2.7)
Net current period other comprehensive income (loss)	(0.6)		(2.5)
Accumulated other comprehensive loss	8.2		8.2
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	0.6	0.8	1.7	1.6
Foreign currency translation adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated other comprehensive loss	(46.5)		(50.9)
Other comprehensive income (loss) before reclassifications	(1.1)		3.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0		0.0
Net current period other comprehensive income (loss)	(1.1)		3.3
Accumulated other comprehensive loss	(47.6)		(47.6)
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	(0.1)	0.1	(0.1)	0.2
Operating expenses	0.0	0.2	0.1	0.4
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	(1.0)	(1.1)	(2.0)	(2.1)
Operating expenses	$ (1.2)	$ (1.2)	$ (2.4)	$ (2.4)