Summary of Significant Accounting Policies Goodwill and Intangible Assets (Details) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
|
Goodwill [Roll Forward] | ||
Goodwill | $ 175.1 | $ 174.0 |
Acquisitions | 0.0 | 1.1 |
Impairments | 0.0 | 0.0 |
Goodwill | 175.1 | 175.1 |
General Insurance Segment [Member] | ||
Goodwill [Roll Forward] | ||
Goodwill | 116.2 | 116.2 |
Acquisitions | 0.0 | 0.0 |
Impairments | 0.0 | 0.0 |
Goodwill | 116.2 | 116.2 |
Title Insurance Group [Member] | ||
Goodwill [Roll Forward] | ||
Goodwill | 58.7 | 57.5 |
Acquisitions | 0.0 | 1.1 |
Impairments | 0.0 | 0.0 |
Goodwill | 58.7 | 58.7 |
Corporate & Other [Member] | ||
Goodwill [Roll Forward] | ||
Goodwill | 0.1 | 0.1 |
Acquisitions | 0.0 | 0.0 |
Impairments | 0.0 | 0.0 |
Goodwill | $ 0.1 | $ 0.1 |