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Acquisition of Business - Narrative (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Jul. 02, 2018
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,114.0 |  | $ 1,112.4 |
Infinity Property and Casualty Corporation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business acquisition, percentage of voting interests acquired |  |  |  | 100.00%
Business combination, recognized identifiable assets acquired and liabilities assumed, legal accruals, other liabilities and tax related balance |  | $ 2.7 |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, deferred tax liabilities, current |  | 0.2 |  |
Goodwill |  | $ 2.5 |  | $ 791.0

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