SOFTWARE DEVELOPMENT COSTS AND LICENSES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025
Capitalized software development costs and licenses
Current	$ 79.6		$ 79.6		$ 80.8
Non-current	2,101.8		2,101.8		1,892.6
Impairment of software development costs and licenses	0.4	$ 11.5	(4.2)	$ 34.8
Software development costs, internally developed
Capitalized software development costs and licenses
Current	66.9		66.9		62.9
Non-current	2,056.5		2,056.5		1,845.6
Software development costs, externally developed
Capitalized software development costs and licenses
Current	2.6		2.6		0.5
Non-current	42.8		42.8		39.7
Licenses
Capitalized software development costs and licenses
Current	10.1		10.1		17.4
Non-current	$ 2.5		$ 2.5		$ 7.3