OTHER - Other Income - Net (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Income and Expenses [Abstract]
Net investment gains	$ (5.1)	$ (3.2)
Net expense from banking activities	3.3	3.9
Foreign currency transaction related losses - net	7.6	6.8
Miscellaneous periodic benefit income	(4.9)	(5.1)
Other income	(9.0)	(14.6)
Other expense	0.4	9.0
Other income - net	$ (7.7)	$ (3.2)