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Investments in Unconsolidated Subsidiaries - Equity Method Investments (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
Dec. 31, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 1,196,088 $ 452,365
Real Estate Investments    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries 453,813 340,248
Altus Power    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries 368,368 0
Class A common stock    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 229,900 0
Common stock shares (in shares) 22  
Alignment shares    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 114,727 0
Private placement warrants    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 23,741 0
Warrants, exercise price (in usd per share) $ 11.00  
Other    
Schedule of Equity Method Investments [Line Items]    
Total investment in unconsolidated subsidiaries $ 373,907 $ 112,117