Accumulated Other Comprehensive Income (Loss) Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Aug. 28, 2020	Aug. 23, 2019	Aug. 28, 2020	Aug. 23, 2019	May 29, 2020	Feb. 28, 2020	May 24, 2019	Feb. 22, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (56.3)	$ (61.8)	$ (56.3)	$ (61.8)	$ (77.9)	$ (69.3)	$ (55.1)	$ (47.3)
Other comprehensive income (loss) before reclassifications	21.7		13.1
Income Tax Expense (Benefit)	27.3	21.6	10.6	27.9
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.1)		0.1
Interest Expense	6.8	6.7	14.1	13.4
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	21.6		13.0
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.1)	(1.1)	(0.1)	(1.4)
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)		(0.3)	(0.1)
Other comprehensive income (loss) before reclassifications	0.1		(0.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0		0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.1		(0.1)
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	0.2	0.0	0.2
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	(3.9)		(3.9)		(2.8)	(3.1)
Other comprehensive income (loss) before reclassifications	(0.8)		(0.3)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.3)		0.5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	(1.1)		(0.8)
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)	0.1	0.1	0.2	0.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.3)	(0.8)	(0.5)	(1.3)
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	(8.2)		(8.2)		(8.4)	(8.6)
Other comprehensive income (loss) before reclassifications	0.0		0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.2)		(0.4)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	0.2		0.4
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)	(0.1)	(0.2)	(0.2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.2	0.2	0.4	0.4
Foreign currency translation adjustments [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(44.0)		(44.0)		$ (66.4)	$ (57.5)
Other comprehensive income (loss) before reclassifications	22.4		13.5
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0		0.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	22.4		13.5
Prior Service Costs | 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)	(0.1)	(0.1)	(0.1)
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	(0.3)	(0.8)	(0.6)	(1.5)
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	(0.7)	0.0	(0.7)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [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]
Interest Expense	$ 0.3	$ 0.3	$ 0.6	$ 0.6