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STOCKHOLDERS' EQUITY - AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Total stockholders' equity, Beginning of Period $ 1,181.2 $ 1,109.6
Total stockholders' equity, End of Period 1,672.3 1,181.2
CTA    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Total stockholders' equity, Beginning of Period (285.5) (188.0)
Other comprehensive income (loss) before reclassifications 57.2 (97.1)
Amounts reclassified from AOCI 0.0 (0.4)
Net other comprehensive income (loss) 57.2 (97.5)
Total stockholders' equity, End of Period (228.3) (285.5)
Derivative Hedging Adj.    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Total stockholders' equity, Beginning of Period (6.4) 4.0
Other comprehensive income (loss) before reclassifications (0.9) (4.0)
Amounts reclassified from AOCI 1.9 (6.4)
Net other comprehensive income (loss) 1.0 (10.4)
Total stockholders' equity, End of Period (5.4) (6.4)
Debt & Equity Securities Adj.    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Total stockholders' equity, Beginning of Period (3.5) 0.0
Other comprehensive income (loss) before reclassifications 0.8 (3.5)
Amounts reclassified from AOCI 0.0 0.0
Net other comprehensive income (loss) 0.8 (3.5)
Total stockholders' equity, End of Period (2.7) (3.5)
Pension Liability Adj.    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Total stockholders' equity, Beginning of Period (46.2) (44.5)
Other comprehensive income (loss) before reclassifications (6.2) (2.9)
Amounts reclassified from AOCI 1.7 1.2
Net other comprehensive income (loss) (4.5) (1.7)
Total stockholders' equity, End of Period (50.7) (46.2)
Total    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Total stockholders' equity, Beginning of Period (341.6) (228.5)
Other comprehensive income (loss) before reclassifications 50.9 (107.5)
Amounts reclassified from AOCI 3.6 (5.6)
Net other comprehensive income (loss) 54.5 (113.1)
Total stockholders' equity, End of Period $ (287.1) $ (341.6)