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STOCKHOLDERS' EQUITY - AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Total stockholders' equity, Beginning of Period $ 921.5 $ 932.3
Total stockholders' equity, End of Period 1,109.6 921.5
CTA    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Total stockholders' equity, Beginning of Period (145.2) (208.2)
Other comprehensive income (loss) before reclassifications (42.7) 63.0
Amounts reclassified from AOCI (0.1) 0.0
Net other comprehensive income (loss) (42.8) 63.0
Total stockholders' equity, End of Period (188.0) (145.2)
Derivative Hedging Adj.    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Total stockholders' equity, Beginning of Period (6.0) (0.8)
Other comprehensive income (loss) before reclassifications 21.3 (9.2)
Amounts reclassified from AOCI (11.3) 4.0
Net other comprehensive income (loss) 10.0 (5.2)
Total stockholders' equity, End of Period 4.0 (6.0)
Derivative Hedging Adj. | Commodity swaps    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Amounts reclassified from AOCI (12.1)  
Reclassification from AOCI, Current Period, Tax 3.5  
Debt & Equity Securities Adj.    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Total stockholders' equity, Beginning of Period 1.2 2.6
Other comprehensive income (loss) before reclassifications (1.2) (1.4)
Amounts reclassified from AOCI 0.0 0.0
Net other comprehensive income (loss) (1.2) (1.4)
Total stockholders' equity, End of Period 0.0 1.2
Pension Liability Adj.    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Total stockholders' equity, Beginning of Period (58.4) (51.1)
Other comprehensive income (loss) before reclassifications 11.9 (8.6)
Amounts reclassified from AOCI 2.0 1.3
Net other comprehensive income (loss) 13.9 (7.3)
Total stockholders' equity, End of Period (44.5) (58.4)
Total    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Total stockholders' equity, Beginning of Period (208.4) (257.5)
Other comprehensive income (loss) before reclassifications (10.7) 43.8
Amounts reclassified from AOCI (9.4) 5.3
Net other comprehensive income (loss) (20.1) 49.1
Total stockholders' equity, End of Period $ (228.5) $ (208.4)