OTHER COMPREHENSIVE INCOME OR LOSS - Changes in the AOCI Balance (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 26, 2022	Feb. 27, 2021	Feb. 29, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,324.3	$ 2,278.1	$ 1,450.7
Other comprehensive income (loss) before reclassifications	22.1	242.5
Amounts reclassified from Accumulated other comprehensive income	(15.5)	2.8
Tax (expense) benefit	(1.1)	(63.3)
Other comprehensive income (loss)	5.5	182.0	(209.8)
Ending balance	3,024.6	1,324.3	2,278.1
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	63.5	(118.5)	91.3
Ending balance	69.0	63.5	(118.5)
Pension and Post-retirement benefit plan items
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	61.3	(121.7)
Other comprehensive income (loss) before reclassifications	22.9	244.5
Amounts reclassified from Accumulated other comprehensive income	(15.5)	2.8
Tax (expense) benefit	(1.6)	(64.3)
Other comprehensive income (loss)	5.8	183.0
Ending balance	67.1	61.3	(121.7)
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	2.2	3.2
Other comprehensive income (loss) before reclassifications	(0.8)	(2.0)
Amounts reclassified from Accumulated other comprehensive income	0.0	0.0
Tax (expense) benefit	0.5	1.0
Other comprehensive income (loss)	(0.3)	(1.0)
Ending balance	$ 1.9	$ 2.2	$ 3.2