RETIREMENT BENEFIT PLANS - Analysis of Plan Assets (Details) - Retirement Plans - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 350.1	$ 335.8	$ 577.0
Percentage of plan assets (percent)	100.00%	100.00%
Cash and cash equivalents
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 36.9	$ 33.1
Percentage of plan assets (percent)	10.50%	9.80%
Fund investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 75.6	$ 86.3
Percentage of plan assets (percent)	21.60%	25.70%
Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 15.7	$ 14.9
Percentage of plan assets (percent)	4.50%	4.40%
Government debt securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 16.3	$ 9.6
Percentage of plan assets (percent)	4.70%	2.90%
Guaranteed investments contracts
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 97.0	$ 96.0
Percentage of plan assets (percent)	27.70%	28.60%
Other investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 108.6	$ 95.9
Percentage of plan assets (percent)	31.00%	28.60%