Accumulated Other Comprehensive Income (Loss) Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 24, 2017	Nov. 25, 2016	Nov. 24, 2017	Nov. 25, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (28.5)		$ (50.6)
Other comprehensive income (loss) before reclassifications	5.8		26.2
Amounts reclassified from accumulated other comprehensive income (loss)	(1.5)		0.2
Net current period other comprehensive income (loss)	4.3	$ (19.7)	26.4	$ (19.0)
Balance as of November 24, 2017	(24.2)		(24.2)
Cost of sales	520.3	524.6	1,529.8	1,504.3
Operating expenses	213.3	207.5	630.4	604.5
Income Tax Expense (Benefit)	12.0	13.6	36.1	47.3
Net income	25.7	41.2	80.7	98.8
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	(1.5)	(1.5)	0.2	(4.2)
Unrealized gain (loss) on investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	0.0		(0.3)
Other comprehensive income (loss) before reclassifications	0.0		0.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0		0.0
Net current period other comprehensive income (loss)	0.0		0.3
Balance as of November 24, 2017	0.0		0.0
Pension and other post-retirement liability adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	14.5		13.0
Other comprehensive income (loss) before reclassifications	(0.5)		(0.7)
Amounts reclassified from accumulated other comprehensive income (loss)	(1.5)		0.2
Net current period other comprehensive income (loss)	(2.0)		(0.5)
Balance as of November 24, 2017	12.5		12.5
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 (Benefit)	1.0	0.8	0.8	2.4
Foreign currency translation adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(43.0)		(63.3)
Other comprehensive income (loss) before reclassifications	6.3		26.6
Amounts reclassified from accumulated other comprehensive income (loss)	0.0		0.0
Net current period other comprehensive income (loss)	6.3		26.6
Balance as of November 24, 2017	(36.7)		(36.7)
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	(0.4)	(0.1)	(1.3)	(0.2)
Operating expenses	(0.3)	0.0	(1.1)	0.1
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	(0.8)	(1.0)	(2.4)	(3.0)
Operating expenses	(1.0)	(1.2)	(2.9)	(3.5)
Reclassification out of accumulated Other Comprehensive Income due to Defined Benefit Plan Settlements [Member] | 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	0.0	3.9	0.0
Operating expenses	$ 0.0	$ 0.0	$ 3.2	$ 0.0