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RETIREMENT BENEFIT PLANS - Changes in Fair value of Plan Assets (Details) - Retirement Plans - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Roll Forwards [Abstract]    
Beginning balance $ 585.0 $ 524.5
Actual return on plan assets 26.4 55.2
Foreign currency changes (7.9) 20.1
Contributions from the company 13.8 25.5
Benefits paid (10.1) (11.5)
Settlement and other (30.2) (28.8)
Ending balance $ 577.0 $ 585.0