RETIREMENT AND BENEFIT PLANS Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	Feb. 01, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit payments	$ (75.6)	$ (49.1)
Actuarial (gain) loss on retirement and benefit plans	39.1	20.2	$ (138.9)
Pension Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance at beginning of year	651.7	734.8
Service cost	24.4	29.9
Interest cost	29.8	27.8	28.5
Benefit payments	(75.6)	(49.1)
Benefit payments, net of retiree contributions	0.0	0.0
Medicare subsidy	0.0	0.0
Actuarial (gain) loss on retirement and benefit plans	(2.8)	(91.7)
Balance at end of year	627.5	651.7	734.8
Defined Benefit Plan, Lump sum settlement payments (included in benefit payments)	44.8	20.1
SERP Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance at beginning of year	88.6	98.5
Service cost	4.3	5.6
Interest cost	3.9	3.7	4.0
Benefit payments	(8.5)	(10.1)
Benefit payments, net of retiree contributions	0.0	0.0
Medicare subsidy	0.0	0.0
Actuarial (gain) loss on retirement and benefit plans	(0.7)	(9.1)
Balance at end of year	87.6	88.6	98.5
Postretirement Plans [Member]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Balance at beginning of year	15.8	18.1
Service cost	0.0	0.0
Interest cost	0.5	0.6	0.8
Benefit payments	0.0	0.0
Benefit payments, net of retiree contributions	(1.9)	(1.9)
Medicare subsidy	0.0	0.0
Actuarial (gain) loss on retirement and benefit plans	(3.0)	(1.0)
Balance at end of year	$ 11.4	$ 15.8	$ 18.1