v3.26.1
STOCKHOLDERS' EQUITY AND EARNINGS PER SHARE - Components of and changes in AOCIL, net of income taxes (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2026
Mar. 31, 2026
Jun. 30, 2025
Mar. 31, 2025
Components of and changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning Balance $ 1,384.4 $ 1,362.8 $ 1,230.3 $ 1,203.1
Ending Balance 1,456.1 1,384.4 1,257.3 1,230.3
Accumulated Other Comprehensive Income (loss)        
Components of and changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning Balance 2.9 6.2 (7.3) (11.8)
Other comprehensive income (loss) prior to reclassifications (2.0) (3.2) 16.2 4.5
Amounts reclassified from accumulated other comprehensive income (loss) (0.2) (0.1) (0.1)  
Ending Balance 0.7 2.9 8.8 (7.3)
Foreign Currency Translation        
Components of and changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning Balance (10.3) (7.1) (17.7) (22.3)
Other comprehensive income (loss) prior to reclassifications (2.0) (3.2) 16.2 4.5
Amounts reclassified from accumulated other comprehensive income (loss) 0.0     0.1
Ending Balance (12.3) (10.3) (1.5) (17.7)
Defined Employee Benefit Plan        
Components of and changes in accumulated other comprehensive income (loss), net of income taxes        
Beginning Balance 13.2 13.3 10.4 10.5
Amounts reclassified from accumulated other comprehensive income (loss) (0.2) (0.1) (0.1) (0.1)
Ending Balance $ 13.0 $ 13.2 $ 10.3 $ 10.4