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v3.19.1

Investments (Continuous unrealized loss) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
U.S. Government and Government Agencies and Authorities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
12 Months or Longer | $ 262.2 | $ 79.0
Total | 275.4 | 480.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 13.2 | 401.1
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 0.2 | 7.6
12 Months or Longer | 7.5 | 7.4
Total | 7.7 | 15.0
States and Political Subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
12 Months or Longer | 77.8 | 102.6
Total | 79.4 | 402.0
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1.6 | 299.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 0.3 | 5.0
12 Months or Longer | 1.4 | 3.6
Total | 1.7 | 8.6
Foreign Governments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 4.9
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
12 Months or Longer | 0.5 |
Total | 4.9 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 4.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 4.4 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 0.5 |
12 Months or Longer | 0.1 |
Total | 0.6 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 0.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0.0
Bonds and Notes |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
12 Months or Longer | 321.4 | 116.8
Total | 544.0 | 1,442.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 222.6 | 1,326.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 5.2 | 38.2
12 Months or Longer | 12.6 | 10.9
Total | 17.8 | 49.1
Collateralized Loan Obligations |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
12 Months or Longer | 28.7 | 0.0
Total | 435.3 | 439.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 406.6 | 439.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 6.0 | 13.2
12 Months or Longer | 0.8 | 0.0
Total | 6.8 | 13.2
Other Mortgage- and Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 4.7
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
12 Months or Longer | 4.6 |
Total | 4.6 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value |  | 0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 0.0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value |  | 4.5
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 0.0 |
12 Months or Longer | 0.0 |
Total | 0.0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss |  | 0.1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0.1
Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
12 Months or Longer | 695.2 | 302.9
Total | 1,343.6 | 2,773.7
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 648.4 | 2,470.8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 12.2 | 64.6
12 Months or Longer | 22.4 | 22.0
Total | 34.6 | 86.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | 34.6 | 86.6
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $ 22.4 | $ 22.0

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