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Goodwill and Other Intangible Assets (Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Oct. 10, 2014 | Mar. 14, 2014 | Feb. 19, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 232.3 | $ 198.3 |  |  |  |
Amortization of Intangible Assets | 44.5 | 16.0 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | 187.8 | 182.3 |  |  |  | $ 5.1
Goodwill | 187.9 | 168.9 |  |  |  | $ 0.0
Intangible Assets, Gross (Including Goodwill) | 420.2 | 367.2 |  |  |  |
Goodwill and intangible assets | 375.7 | 351.2 |  |  |  |
Tranzact [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 177.5 | 146.3 |  |  |  |
Amortization of Intangible Assets | 21.4 | 3.5 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | 156.1 | 142.8 | $ 146.3 |  |  |
Goodwill | 163.8 | 145.1 | $ 145.1 |  |  |
MediaAlpha |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 38.5 | 38.5 |  |  |  |
Amortization of Intangible Assets | 14.1 | 6.0 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | 24.4 | 32.5 |  | $ 38.5 |  |
Goodwill | 18.3 | 18.3 |  | $ 18.3 |  |
WOBI [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 5.7 | 2.9 |  |  |  |
Amortization of Intangible Assets | 1.2 | 0.4 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | 4.5 | 2.5 |  |  |  |
Goodwill | 5.8 | 5.5 |  |  | $ 5.5 |
Developed Technology Rights [Member] | Tranzact [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 12.7 | 12.7 |  |  |  |
Amortization of Intangible Assets | 2.8 | 0.5 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 9.9 | 12.2 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 6 years |  |  |  |  |
Developed Technology Rights [Member] | MediaAlpha |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 32.0 | 32.0 |  |  |  |
Amortization of Intangible Assets | 11.2 | 4.8 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 20.8 | 27.2 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 5 years |  |  |  |  |
Developed Technology Rights [Member] | WOBI [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 3.6 | 0.8 |  |  |  |
Amortization of Intangible Assets | 0.7 | 0.2 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 2.9 | 0.6 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years |  |  |  |  |
Customer Relationships [Member] | Tranzact [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 132.3 | 107.5 |  |  |  |
Amortization of Intangible Assets | 13.1 | 2.1 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 119.2 | 105.4 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 11 years |  |  |  |  |
Customer Relationships [Member] | MediaAlpha |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 6.5 | 6.5 |  |  |  |
Amortization of Intangible Assets | 2.9 | 1.2 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 3.6 | 5.3 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years |  |  |  |  |
Customer Relationships [Member] | Star & Shield LLC [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years |  |  |  |  |
Customer Relationships [Member] | Star & Shield Insurance Exchange [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 1.2 | 1.2 |  |  |  |
Amortization of Intangible Assets | 0.8 | 0.4 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | 0.4 | 0.8 |  |  |  |
Trademarks [Member] | WOBI [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 2.1 | 2.1 |  |  |  |
Amortization of Intangible Assets | 0.5 | 0.2 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 1.6 | 1.9 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 8 years |  |  |  |  |
Other Intangible Assets [Member] | Tranzact [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 2.0 | 0.5 |  |  |  |
Amortization of Intangible Assets | 0.1 | 0.0 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 1.9 | 0.5 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 8 years |  |  |  |  |
Other Intangible Assets [Member] | OneBeacon |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 9.4 | 9.4 |  |  |  |
Amortization of Intangible Assets | 7.0 | 5.7 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 2.4 | 3.7 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 10 years |  |  |  |  |
Trade Names [Member] | Tranzact [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Intangible Assets, Gross (Excluding Goodwill) | $ 30.5 | 25.6 |  |  |  |
Amortization of Intangible Assets | 5.4 | 0.9 |  |  |  |
Intangible Assets, Net (Excluding Goodwill) | $ 25.1 | $ 24.7 |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 7 years |  |  |  |  |

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