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Basis of Financial Statements - Revision of Prior Period Financial Statements (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard |  |  |  |  |  |  |  | $ 15,500,000 | $ 1,900,000 |
Depreciation and amortization |  |  |  |  |  | $ (40,100,000) | $ (45,300,000) |  |  |
Income tax expense (benefit) | $ 15,600,000 | $ 5,900,000 | $ (7,200,000) | $ (900,000) | $ (1,300,000) | 14,300,000 | (3,800,000) |  |  |
Net earnings (loss) | (41,600,000) | (18,900,000) | 19,900,000 | 8,100,000 | 1,000,000.0 | (40,600,000) | 35,800,000 |  |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  | (2,600,000) | (2,400,000) |  | (5,000,000.0) |  |  |  |  |
Net earnings (loss) |  | $ (3,900,000) | $ 21,900,000 |  | $ 18,000,000.0 |  |  |  |  |
Retained Earnings |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard |  |  |  |  |  |  |  | $ 20,500,000 | $ 1,900,000 |
Net earnings (loss) | $ (46,200,000) |  |  | (1,500,000) |  | $ (52,800,000) | 19,400,000 |  |  |
Decrease To other operating revenue | Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Other operating revenue |  |  |  | 0 |  |  | 3,100,000 |  |  |
Decrease to depreciation and amortization | Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  | 600,000 |  |  | 1,600,000 |  |  |
Increase to income tax benefit | Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  | 200,000 |  |  | (1,500,000) |  |  |
Increase To Net Loss And Net Loss Attributable to Cannae | Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Net earnings (loss) |  |  |  | 400,000 |  |  | $ 0 |  |  |
Increase To Net Loss Per Share | Restatement Adjustment |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Net loss per share (in usd per share) |  |  |  |  |  |  | $ 0 |  |  |
ASU 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 | Retained Earnings |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard |  |  |  | 1,900,000 |  |  | $ 1,900,000 |  |  | $ 4,300,000
T-System | ASU 2014-09 | Adjustments for error corrections to prior interim periods of current year | Retained Earnings |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |
Decrease in cumulative effect of adoption of ASC Topic 606 |  |  |  | $ 2,400,000 |  |  | $ 2,400,000 |  |  |

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