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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ (287.1) $ (341.6)
Other comprehensive income (loss) before reclassifications (29.6) 24.4
Amounts reclassified from AOCI 0.8 1.9
Net other comprehensive income (loss) (28.8) 26.3
Ending balance (315.9) (315.3)
CTA    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (228.3) (285.5)
Other comprehensive income (loss) before reclassifications (33.9) 24.4
Amounts reclassified from AOCI 0.0 0.0
Net other comprehensive income (loss) (33.9) 24.4
Ending balance (262.2) (261.1)
Derivative Hedging Adj.    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (5.4) (6.4)
Other comprehensive income (loss) before reclassifications 4.0 0.5
Amounts reclassified from AOCI 0.3 1.4
Net other comprehensive income (loss) 4.3 1.9
Ending balance (1.1) (4.5)
Debt & Equity Securities Adj.    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (2.7) (3.5)
Other comprehensive income (loss) before reclassifications (0.2) 0.5
Amounts reclassified from AOCI 0.0 0.0
Net other comprehensive income (loss) (0.2) 0.5
Ending balance (2.9) (3.0)
Pension Liability Adj.    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (50.7) (46.2)
Other comprehensive income (loss) before reclassifications 0.5 (1.0)
Amounts reclassified from AOCI 0.5 0.5
Net other comprehensive income (loss) 1.0 (0.5)
Ending balance $ (49.7) $ (46.7)