SUMMARY OF ACCOUNTING POLICIES - Leases (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2019	Mar. 31, 2020	Mar. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease liabilities		$ 643.0	$ 690.0
Operating lease right-of-use assets, net		605.0	642.0
Gain on sales leaseback transaction		32.7
Other current liabilities
Lessee, Lease, Description [Line Items]
Current operating lease liabilities		$ 114.1	$ 127.6
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease liabilities	$ 658.0
Operating lease right-of-use assets, net	624.0
Gain on sales leaseback transaction	$ 22.0