Accumulated Other Comprehensive Income (Loss) Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Nov. 22, 2019	Nov. 23, 2018	Nov. 22, 2019	Nov. 23, 2018	Aug. 23, 2019	Feb. 22, 2019	Aug. 24, 2018	Feb. 23, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Document Period End Date			Nov. 22, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (56.3)	$ (38.0)	$ (56.3)	$ (38.0)	$ (61.8)	$ (47.3)	$ (30.2)	$ (10.3)
Other comprehensive income (loss) before reclassifications	5.7		(7.4)
Cost of sales	639.1	622.7	1,869.5	1,726.0
Income Tax Expense (Benefit)	18.9	7.9	46.8	32.2
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)		1.6
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	5.5		(9.0)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts reclassified from accumulated other comprehensive income (loss)	(0.2)	(1.1)	(1.6)	(3.3)
Unrealized gain (loss) on investments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(0.2)		(0.2)		(0.1)	0.0
Other comprehensive income (loss) before reclassifications	(0.1)		0.3
Amounts reclassified from accumulated other comprehensive income (loss)	0.0		0.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(0.1)		(0.2)
Unrealized gain (loss) on investments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense (Benefit)	0.0	0.0	0.2	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.0	0.0	(0.5)	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	8.1		8.1		9.2	9.7
Other comprehensive income (loss) before reclassifications	(0.6)		0.2
Amounts reclassified from accumulated other comprehensive income (loss)	(0.5)		1.8
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1.1)		(1.6)
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)	0.4	0.4	0.7	1.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.5)	(1.1)	(1.8)	(3.4)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8.9)		(8.9)		(9.2)	(9.6)
Other comprehensive income (loss) before reclassifications	0.0		0.0
Amounts reclassified from accumulated other comprehensive income (loss)	(0.3)		(0.7)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.3		0.7
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense (Benefit)	(0.1)	0.0	(0.3)	0.0
Amounts reclassified from accumulated other comprehensive income (loss)	0.3	0.0	0.7	0.0
Foreign currency translation adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(55.3)		(55.3)		$ (61.7)	$ (47.4)
Other comprehensive income (loss) before reclassifications	6.4		(7.9)
Amounts reclassified from accumulated other comprehensive income (loss)	0.0		0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	6.4		(7.9)
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]
Other Income	(0.8)	(0.9)	(2.3)	(2.6)
Derivative [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Income	0.4	0.0	1.0	0.0
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]
Other Income	(0.1)	(0.6)	(0.2)	(1.8)
Foreign Currency [Domain] | Foreign currency translation adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Income	0.0	0.0	0.0	0.1
Gain (Loss) on Investments [Member] | Unrealized gain (loss) on investments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Investment Income, Nonoperating	$ 0.0	$ 0.0	$ (0.7)	$ 0.0