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STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE - Components of and changes in AOCIL, net of income taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Components of and changes in accumulated other comprehensive income (loss), net of income taxes            
Beginning Balance $ 1,257.3 $ 1,230.3 $ 1,203.1 $ 1,164.9 $ 1,143.1 $ 1,144.1
Ending Balance 1,307.2 1,257.3 1,230.3 1,164.3 1,164.9 1,143.1
Accumulated Other Comprehensive Income (loss)            
Components of and changes in accumulated other comprehensive income (loss), net of income taxes            
Beginning Balance 8.8 (7.3) (11.8) (6.9) (1.9) 6.1
Other comprehensive income (loss) prior to reclassifications (3.4) 16.2 4.5 9.0 (2.2) (5.2)
Amounts reclassified from accumulated other comprehensive income (loss) (0.1) (0.1)     (2.8) (2.8)
Ending Balance 5.3 8.8 (7.3) 2.1 (6.9) (1.9)
Foreign Currency Translation            
Components of and changes in accumulated other comprehensive income (loss), net of income taxes            
Beginning Balance (1.5) (17.7) (22.3) (20.0) (17.4) (10.8)
Other comprehensive income (loss) prior to reclassifications (3.4) 16.2 4.5 10.8 (2.6) (6.6)
Amounts reclassified from accumulated other comprehensive income (loss)     0.1 1.6    
Ending Balance (4.9) (1.5) (17.7) (7.6) (20.0) (17.4)
Change in Fair Value of Cash Flow Hedges            
Components of and changes in accumulated other comprehensive income (loss), net of income taxes            
Beginning Balance       1.7 4.1 5.5
Other comprehensive income (loss) prior to reclassifications       0.4 0.4 1.4
Amounts reclassified from accumulated other comprehensive income (loss)       (2.1) (2.8) (2.8)
Ending Balance         1.7 4.1
Defined Employee Benefit Plan            
Components of and changes in accumulated other comprehensive income (loss), net of income taxes            
Beginning Balance 10.3 10.4 10.5 11.4 11.4 11.4
Other comprehensive income (loss) prior to reclassifications       (2.2)    
Amounts reclassified from accumulated other comprehensive income (loss) (0.1) (0.1) (0.1) 0.5    
Ending Balance $ 10.2 $ 10.3 $ 10.4 $ 9.7 $ 11.4 $ 11.4