OTHER COMPREHENSIVE INCOME OR LOSS - Changes in the AOCI Balance (Details) - USD ($) $ in Millions	3 Months Ended		4 Months Ended	6 Months Ended
	Sep. 07, 2019	Sep. 08, 2018	Jun. 16, 2018	Sep. 07, 2019	Sep. 08, 2018	Feb. 24, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 2,054.4	$ 1,391.3	$ 1,398.2	$ 1,450.7	$ 1,398.2
Cumulative effect of accounting change						$ 574.6
Other comprehensive (loss) income before reclassifications				(36.7)	2.2
Amounts reclassified from accumulated other comprehensive income				(1.0)	(0.5)
Tax (expense) benefit				9.9	(0.6)
Other comprehensive (loss) income	(9.3)	(4.8)	5.9	(11.2)	1.1
Ending balance	2,345.5	1,362.6	1,391.3	2,345.5	1,362.6
Accumulated other comprehensive income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	89.4	197.0	191.1	91.3	191.1
Cumulative effect of accounting change						16.6
Other comprehensive (loss) income		(4.8)	5.9
Ending balance	80.1	192.2	197.0	80.1	192.2
Interest rate swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			18.9	3.4	18.9
Other comprehensive (loss) income before reclassifications				(50.3)	2.9
Amounts reclassified from accumulated other comprehensive income				(3.2)	1.7
Tax (expense) benefit				14.0	(1.2)
Other comprehensive (loss) income				(38.3)	3.4
Ending balance	(34.9)	22.3		(34.9)	22.3
Pension and Post-retirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			171.9	88.8	171.9
Other comprehensive (loss) income before reclassifications				10.2	0.0
Amounts reclassified from accumulated other comprehensive income				2.2	(1.5)
Tax (expense) benefit				(3.2)	0.4
Other comprehensive (loss) income				24.1	(1.1)
Ending balance	112.9	170.8		112.9	170.8
Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ 0.3	(0.9)	0.3
Other comprehensive (loss) income before reclassifications				3.4	(0.7)
Amounts reclassified from accumulated other comprehensive income				0.0	(0.7)
Tax (expense) benefit				(0.9)	0.2
Other comprehensive (loss) income				3.0	(1.2)
Ending balance	$ 2.1	$ (0.9)		$ 2.1	$ (0.9)
ASU 2016-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of accounting change						16.6
ASU 2016-02 | Interest rate swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of accounting change						1.2
ASU 2016-02 | Pension and Post-retirement benefit plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of accounting change						14.9
ASU 2016-02 | Other
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of accounting change						$ 0.5