SOFTWARE DEVELOPMENT COSTS AND LICENSES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Mar. 31, 2024
Capitalized software development costs and licenses
Current	$ 96.9		$ 96.9		$ 88.3
Non-current	1,731.2		1,731.2		1,446.5
Impairment of software development costs and licenses	11.5	$ 3.5	34.8	$ 21.7
Software development costs, internally developed
Capitalized software development costs and licenses
Current	71.1		71.1		53.4
Non-current	1,670.0		1,670.0		1,237.0
Software development costs, externally developed
Capitalized software development costs and licenses
Current	7.4		7.4		6.1
Non-current	51.5		51.5		198.5
Licenses
Capitalized software development costs and licenses
Current	18.4		18.4		28.8
Non-current	$ 9.7		$ 9.7		$ 11.0