OTHER COMPREHENSIVE INCOME OR LOSS - Changes in the AOCI Balance (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 11, 2021	Sep. 12, 2020	Sep. 11, 2021	Sep. 12, 2020
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,698.4	$ 1,194.9	$ 1,324.3	$ 2,278.1
Other comprehensive income before reclassifications			34.3	11.1
Amounts reclassified from accumulated other comprehensive income			(14.0)	4.9
Tax expense			(5.1)	(3.9)
Other comprehensive income	15.1	10.4	15.2	12.1
Ending balance	1,959.9	1,501.6	1,959.9	1,501.6
Accumulated other comprehensive income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	63.6	(116.8)	63.5	(118.5)
Ending balance	78.7	(106.4)	78.7	(106.4)
Pension and Post-retirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			61.3	(121.7)
Other comprehensive income before reclassifications			34.3	9.6
Amounts reclassified from accumulated other comprehensive income			(14.0)	4.9
Tax expense			(5.1)	(3.6)
Other comprehensive income			15.2	10.9
Ending balance	76.5	(110.8)	76.5	(110.8)
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			2.2	3.2
Other comprehensive income before reclassifications			0.0	1.5
Amounts reclassified from accumulated other comprehensive income			0.0	0.0
Tax expense			0.0	(0.3)
Other comprehensive income			0.0	1.2
Ending balance	$ 2.2	$ 4.4	$ 2.2	$ 4.4