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Basis of Financial Statements - Recent Developments (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Sep. 05, 2019 | Sep. 01, 2019 | Jul. 23, 2019 | Jun. 27, 2019 | May 22, 2019 | Mar. 21, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 08, 2019 | Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  |  |  |  |  |  |  | $ 526.2 | $ 0.0 |  |  |  |
Realized gains, net |  |  |  |  |  |  |  |  |  | $ 93.0 | $ 11.3 | 169.1 | 77.8 |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  | 20.5 |  | 20.5 |  |  |  |  | $ 25.2
Proceeds from sale of corporate office |  |  |  |  |  |  |  |  |  |  |  | 13.2 | 0.0 |  |  |  |
Reclass to property and equipment, net |  |  |  |  |  |  |  |  |  | 155.8 |  | 155.8 |  |  |  |  | 176.4
Proceeds from sale of corporate offices and stores |  |  |  |  |  |  |  |  |  |  |  | 18.7 | $ 3.2 |  |  |  |
Investment in partnership |  |  |  |  |  |  |  | $ 887.3 |  | 851.9 |  | 851.9 |  |  | $ 904.5 |  | 397.2
Management Services Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management Services Agreement, automatic renewal term |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in partnership |  |  |  |  |  |  |  | (26.0) |  |  |  |  |  |  | $ (26.3) |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | ABRH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  | 3.9 |  | 3.9 |  |  |  |  | 9.3
Proceeds from sale of corporate office |  |  |  |  |  |  | $ 13.2 |  |  |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Liability for finance obligation |  |  |  |  |  |  | $ 13.2 |  |  |  |  |  |  |  |  |  |
Proceeds from sale of corporate offices and stores |  |  |  |  |  |  |  |  |  |  |  | 15.7 |  |  |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | ABRH | Restatement Adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  | (2.4) |  | (2.4) |  |  |  |  |
Reclass to property and equipment, net |  |  |  |  |  |  |  |  |  | $ 2.4 |  | $ 2.4 |  |  |  |  |
Dun And Bradstreet |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  | $ 23.5 |  |  | $ 23.5 |  |  |  |  |  |  |  |  |
Outstanding voting equity |  |  |  |  |  |  |  |  |  | 24.30% |  | 24.30% |  | 24.30% |  |  |
Investment in partnership |  |  |  |  |  |  |  |  |  | $ 446.2 |  | $ 446.2 |  |  |  |  | 0.0
Ceridian |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding voting equity |  |  |  |  |  |  |  |  |  | 20.00% |  | 20.00% |  |  |  |  |
Investment in partnership |  |  |  |  |  |  |  |  |  | $ 370.3 |  | $ 370.3 |  |  |  |  | $ 359.7
Ceridian | Underwritten Secondary Public Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of stock (in shares) |  | 2.0 |  |  |  | 2.0 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, price per share received (usd per share) |  | $ 56.30 |  |  |  | $ 50.50 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, discounted price per share (usd per share) |  | $ 56.00 |  |  |  | $ 50.25 |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of stock |  | $ 112.0 |  |  |  | $ 100.5 |  |  |  |  |  |  |  |  |  |  |
Realized gains, net |  | 82.2 |  |  |  | 71.1 |  |  |  |  |  |  |  |  |  |  |
Losses on sale of stock |  | 4.9 |  |  |  | 4.2 |  |  |  |  |  |  |  |  |  |  |
Sale of stock, tax benefit |  | $ 1.0 |  |  |  | $ 1.1 |  |  |  |  |  |  |  |  |  |  |
QOMPLX, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  | $ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding voting equity |  |  |  | 19.90% |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in partnership |  |  |  | $ 79.0 |  |  |  |  |  | $ 15.0 |  | $ 15.0 |  |  |  |  |
QOMPLX, Inc. | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment | $ 7.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
QOMPLX, Inc. | Scenario Forecast | Equity Investment, Funding | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional investment |  |  |  |  |  |  |  |  | $ 7.5 |  |  |  |  |  |  |  |
Cannae | Dun And Bradstreet | Dun And Bradstreet | Equity Commitment to Purchase, Retained And Funded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment commitment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 505.6 |
Affiliated Entity | Management Services Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fee, percentage |  |  |  |  |  |  |  |  |  | 0.375% |  | 1.50% |  |  |  |  |
Annualized hurdle rate |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate payable to Manager for satisfaction of hurdle rate |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |
Investment return |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Management Services Agreement, initial term |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | Management Services Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on investment |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |
Affiliated Entity | Management Services Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Return on investment |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |

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