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Basis of Financial Statements - Revision of Prior Period Financial Statements (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard | $ 15.5 |  |  |
Depreciation, Depletion and Amortization | (13.9) | $ (14.3) |  |
Income tax benefit | 7.2 | 5.5 |  |
Net loss | (19.9) | (5.3) |  |
Retained Earnings |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard | 20.5 |  |  |
Net loss | (16.8) | (1.1) |  |
Restatement Adjustment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Income tax benefit | 2.4 |  |  |
Net loss | $ (21.9) |  |  |
ASU 2014-09 |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard |  |  | $ 1.9 |
ASU 2014-09 | Retained Earnings |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard |  |  | $ 1.9 |
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ASU 2014-09 | Retained Earnings |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Adjustment for cumulative effect of adoption of accounting standard |  | 1.9 |  | $ 4.3
Adjustments for error corrections to prior interim periods of current year | ASU 2014-09 | T-System | Retained Earnings |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Decrease in cumulative effect of adoption of ASC Topic 606 |  | 2.4 |  |
Decrease To other operating revenue | Restatement Adjustment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Other Operating Income |  | 1.5 |  |
Decrease to depreciation and amortization | Restatement Adjustment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Depreciation, Depletion and Amortization |  | 0.6 |  |
Increase to income tax benefit | Restatement Adjustment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Income tax benefit |  | 1.5 |  |
Decrease to Net loss and Net loss attributable to Cannae | Restatement Adjustment |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Net loss |  | $ 0.6 |  |

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