Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT AND REDEEMABLE PREFERRED SHARES - Redeemable Preferred Shares (Details)

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LONG-TERM DEBT AND REDEEMABLE PREFERRED SHARES - Redeemable Preferred Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]          
Dividend percentage     6.50%    
Preferred dividend, paid in cash percentage     40.00%    
Preferred dividend, paid in kind percentage     60.00%    
Period of dividend payment after annual meeting     3 days    
Preferred dividends paid in arrears     $ 10.7   $ 8.6
6.50% Redeemable Preferred Shares          
Debt Instrument [Line Items]          
Period following latest maturity date     6 months    
Period following issuance of 6.50% redeemable preferred shares     9 years    
Liquidation preference $ 100.0   $ 100.0    
Redemption price 110.7   110.7   $ 108.6
6.50% Redeemable Preferred Shares | Interest Expense          
Debt Instrument [Line Items]          
Dividends 1.8 $ 1.7 3.5 $ 3.4  
Mandatorily Redeemable Preferred Stock          
Debt Instrument [Line Items]          
Mandatory redeemable shares amount $ 100.0   $ 100.0    
SK Holdings Ordinary Shares Exchange          
Debt Instrument [Line Items]          
Number of shares issued in conversion (in shares)     10,000,000    
Preferred stock conversion price (in usd per share) $ 10   $ 10