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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
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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

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