Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Feb. 22, 2019	Feb. 23, 2018	Feb. 24, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 126.0	$ 80.7	$ 124.6
Unrealized gain (loss) on investments	0.4	0.0	(1.4)
Pension and other post-retirement liability adjustments	(6.6)	1.1	4.7
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	(12.9)	0.0	0.0
Foreign currency translation adjustments	(22.7)	38.6	(12.4)
Total other comprehensive income (loss), gross	(41.8)	39.7	(9.1)
Unrealized gain (loss) on investments	(0.1)	0.0	0.5
Pension and other post-retirement liability adjustments	1.6	0.6	(2.4)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	3.3	0.0	0.0
Foreign currency translation adjustments	0.0	0.0	0.0
Total other comprehensive income (loss), tax (expense) benefit	4.8	0.6	(1.9)
Unrealized gain (loss) on investments	0.3	0.0	(0.9)
Pension and other post-retirement liability adjustments	(5.0)	1.7	2.3
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	(9.6)	0.0	0.0
Foreign currency translation adjustments	(22.7)	38.6	(12.4)
Total other comprehensive income (loss), net	(37.0)	40.3	(11.0)
Comprehensive income	$ 89.0	$ 121.0	$ 113.6