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Commitments and Contingencies and Derivative Financial Instruments (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 31, 2017 USD ($)	Dec. 31, 2021 USD ($)	Oct. 01, 2021 USD ($)	Dec. 31, 2012 MW	Dec. 22, 2008 case
Loss Contingencies [Line Items]
Aggregate principal balance of short-term debt		$ 53,400	$ 53,456
Interest Rate Swap and Cross Currency Interest Rate Contract
Loss Contingencies [Line Items]
Fair value of derivative assets		11,200	(800)
Unrealized gain (loss) on derivatives		13,300	7,400
Interest Rate Swap and Cross Currency Interest Rate Contract | Miscellaneous Other Assets
Loss Contingencies [Line Items]
Fair value of derivative assets		18,600	10,200
Interest Rate Swap and Cross Currency Interest Rate Contract | Other Deferred Liabilities
Loss Contingencies [Line Items]
Fair value of derivative assets		(7,400)	(11,000)
Interest Rate Swap
Loss Contingencies [Line Items]
Derivative notional amount		$ 795,700
Interest Rate Swap | SONIA Rate
Loss Contingencies [Line Items]
Derivative fixed interest rate		0.82%
Cross Currency Interest Rate Contract
Loss Contingencies [Line Items]
Derivative notional amount		$ 127,800
Cross Currency Interest Rate Contract | LIBOR
Loss Contingencies [Line Items]
Spread on variable rate		0.875%
Foreign Exchange Forward
Loss Contingencies [Line Items]
Derivative notional amount		$ 503,500	506,500
Fair value of derivative assets		$ 53,800	55,500
Minimum | Interest Rate Swap | LIBOR
Loss Contingencies [Line Items]
Derivative fixed interest rate		0.704%
Minimum | Cross Currency Interest Rate Contract
Loss Contingencies [Line Items]
Term of derivative contract		3 years 6 months
Derivative fixed interest rate		0.726%
Minimum | Foreign Exchange Forward
Loss Contingencies [Line Items]
Term of derivative contract		1 month
Maximum | Interest Rate Swap | LIBOR
Loss Contingencies [Line Items]
Derivative fixed interest rate		1.116%
Maximum | Cross Currency Interest Rate Contract
Loss Contingencies [Line Items]
Term of derivative contract		10 years
Derivative fixed interest rate		0.746%
Maximum | Foreign Exchange Forward
Loss Contingencies [Line Items]
Term of derivative contract		12 months
General Electric and GE Electrical International Inc | Pending Litigation
Loss Contingencies [Line Items]
Plant capacity | MW				360
General Electric and GE Electrical International Inc | Pending Litigation | Minimum
Loss Contingencies [Line Items]
Damages sought	$ 530,000
JKC Australia LNG Pty Limited | Pending Litigation
Loss Contingencies [Line Items]
Damages sought	$ 1,700,000
Kingston Power Plant of the TVA, Secondary Case No. 3:13CV-505-TAV-HBG
Loss Contingencies [Line Items]
Number of pending claims | case					10
LOCs
Loss Contingencies [Line Items]
Aggregate principal balance of short-term debt		$ 273,700	263,800
Surety Bond
Loss Contingencies [Line Items]
Aggregate principal balance of short-term debt		$ 2,300,000	$ 2,100,000

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