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Investments - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Debt and Equity Securities, FV-NI [Line Items] |  |
Equity Securities, FV-NI, Unrealized Gain (Loss) | $ (48.9) |
Debt and Equity Securities, Realized Gain (Loss), Excluding Other-than-temporary Impairment | 2.5 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | $ (6.4)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 3.9
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 0.0 | 0.0
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 0.0 | 0.0
Debt and Equity Securities, Gain (Loss), Excluding Other-than-temporary Impairment Loss | 4.8 |
Investments in Fixed Maturities [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (86.6) | (19.5)
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 22.0 | 13.9
External Credit Rating, Investment Grade [Member] | Investments in Fixed Maturities [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | (69.5) | (12.6)
External Credit Rating, Non Investment Grade [Member] | Investments in Fixed Maturities [Member] |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ (17.1) | $ (6.9)
Percentage of unrealized loss position to amortized cost basis of available for sale security average | 5.00% | 4.00%

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