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Debt - Schedule of Long-Term Debt (Details) - USD ($)
Jun. 30, 2023
Apr. 30, 2023
Mar. 31, 2023
Feb. 28, 2023
Dec. 31, 2022
Debt Instrument [Line Items]          
Carrying Value Long-Term Debt $ 1,541,700,000       $ 1,191,100,000
Principal Outstanding 1,500,700,000       1,132,800,000
Effective Interest Rate Adjustments 16,500,000       19,800,000
Deferred Finance Charges (20,300,000)       (6,400,000)
PPL Delivery Financing          
Debt Instrument [Line Items]          
Carrying Value Long-Term Debt 577,600,000       609,600,000
Long-Term Debt, Fee Amount 26,000,000.0       26,000,000.0
Keppel Delivery Financing          
Debt Instrument [Line Items]          
Carrying Value Long-Term Debt 259,200,000       259,200,000
Long-Term Debt, Fee Amount 13,500,000       13,500,000
$250m Convertible Bonds          
Debt Instrument [Line Items]          
Principal 250,000,000     $ 250,000,000  
Carrying Value Long-Term Debt 250,000,000.0       0
$150m Secured Bonds          
Debt Instrument [Line Items]          
Principal 150,000,000        
Carrying Value Long-Term Debt 150,000,000.0       0
New DNB Facility          
Debt Instrument [Line Items]          
Principal   $ 175,000,000 $ 150,000,000    
Carrying Value Long-Term Debt 145,000,000.0       130,000,000.0
Long-Term Debt, Fee Amount 2,900,000       2,600,000
Hayfin Term Loan Facility          
Debt Instrument [Line Items]          
Carrying Value Long-Term Debt 118,900,000       134,000,000.0
Long-Term Debt, Fee Amount $ 2,400,000       2,800,000
$350m Convertible Bonds          
Debt Instrument [Line Items]          
Principal         $ 350,000,000