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Fair Value - Separate Accounts Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | $ 4,881.0 | $ 4,459.0
Recurring |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,852.0 | 4,459.0
Gross transfers into (out of) level 3 | 1.0 | (4.0)
Recurring | Other receivables |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 29.0 |
Recurring | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 188.0 | 145.0
Recurring | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 4,099.0 | 3,813.0
Recurring | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2.0 | 2.0
Recurring | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 563.0 | 499.0
Recurring | Level 1 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,467.0 | 1,226.0
Recurring | Level 1 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2.0 | 2.0
Recurring | Level 1 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 1,465.0 | 1,224.0
Recurring | Level 1 | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0.0 | 0.0
Recurring | Level 1 | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0.0 | 0.0
Recurring | Level 2 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 3,385.0 | 3,233.0
Recurring | Level 2 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 186.0 | 143.0
Recurring | Level 2 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2,634.0 | 2,589.0
Recurring | Level 2 | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 2.0 | 2.0
Recurring | Level 2 | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 563.0 | 499.0
Recurring | Level 3 |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0.0 | 0.0
Gross transfers into (out of) level 3 | 1.0 | (4.0)
Recurring | Level 3 | Cash and cash equivalents |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0.0 | 0.0
Recurring | Level 3 | Debt securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0.0 | 0.0
Recurring | Level 3 | Equity securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0.0 | 0.0
Recurring | Level 3 | Common/collective trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate accounts assets | 0.0 | 0.0
Recurring | Level 3 | Separate Accounts, financial assets |  |
Fair Value, Separate Account Investment [Line Items] |  |
Gross transfers into (out of) level 3 | $ 0.0 | $ 0.0

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