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Goodwill and Intangible Assets - Finite-lived Intangible Assets (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |  |
Accumulated Amortization | $ 170.0 | $ 158.6 | $ 153.1
Agency relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 159.2 | 159.2 | 159.2
Accumulated Amortization | 96.7 | 88.1 | 85.3
Net Carrying Amount | 62.5 | 71.1 | 73.9
Software rights |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 69.1 | 69.1 | 69.1
Accumulated Amortization | 69.1 | 67.0 | 64.8
Net Carrying Amount | 0.0 | 2.1 | 4.3
Trade name |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 3.6 | 3.6 | 3.6
Accumulated Amortization | 3.6 | 2.9 | 2.4
Net Carrying Amount | 0.0 | 0.7 | 1.2
Finite-Lived Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross Carrying Amount | 231.9 | 231.9 | 231.9
Accumulated Amortization | 169.4 | 158.0 | 152.5
Net Carrying Amount | $ 62.5 | $ 73.9 | $ 79.4

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