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Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2019
Schedule of Financial Receivables [Line Items] |  |
Lease investment with non-investment grade counterparties, gross | $ 295.0 |
Lease investment with non-investment grade counterparties, net of deferred taxes | 7.0 |
Expected claim proceeds | 31.5 |
REMA Funded credit support | $ 36.0 |
Powerton Station [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Counterparties’ S&P Credit Ratings | BB |
Subsequent Event [Member] |  |
Schedule of Financial Receivables [Line Items] |  |
Expected tax payment for REMA restructuring |  | $ 120.0

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