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Financing Receivables (Narrative) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule of Financial Receivables [Line Items] |  |  |  |  |
Lease Receivable adjustment |  | $ 22.0 | $ 55.0 | $ 20.0 | $ 77.0
Provision for Loan and Lease Losses | $ 7.0 |  |  |  |
Lease investment with non-investment grade counterparties, gross |  |  |  | 316.0 |
Lease investment with non-investment grade counterparties, net of deferred taxes |  |  |  | (83.0) |
Expected claim proceeds |  |  |  | 31.5 |
REMA Funded credit support |  |  |  | 36.0 |
Estimated state tax payment related to REMA restructuring |  |  |  | 40.0 |
Estimated federal tax payment related to REMA restructuring |  |  |  | $ 85.0 |
Powerton Station [Member] |  |  |  |  |
Schedule of Financial Receivables [Line Items] |  |  |  |  |
Counterparties’ S&P Credit Ratings |  |  |  | BB |

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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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