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Investments (Continuous unrealized loss) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
U.S. Government and Government Agencies and Authorities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months | $ 428.7 | $ 140.0
12 Months or Longer | 80.9 | 103.4
Total | 509.6 | 243.4
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
12 Months or Longer | 7.8 | 5.1
Less Than 12 Months | 8.1 | 1.1
Total | 15.9 | 6.2
States and Political Subdivisions |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months | 213.6 | 57.0
12 Months or Longer | 98.9 | 124.2
Total | 312.5 | 181.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
12 Months or Longer | 4.1 | 2.0
Less Than 12 Months | 4.2 | 0.3
Total | 8.3 | 2.3
Foreign Governments |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months | 0.6 |
12 Months or Longer | 0.0 |
Total | 0.6 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
12 Months or Longer | 0.0 |
Less Than 12 Months | 0.0 |
Total | 0.0 |
Bonds and Notes |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months | 716.3 | 283.1
12 Months or Longer | 146.8 | 208.9
Total | 863.1 | 492.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
12 Months or Longer | 7.6 | 6.8
Less Than 12 Months | 16.1 | 4.2
Total | 23.7 | 11.0
Collateralized Loan Obligations |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months | 39.5 | 2.8
12 Months or Longer | 0.0 | 2.4
Total | 39.5 | 5.2
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
12 Months or Longer | 0.0 | 0.0
Less Than 12 Months | 0.1 | 0.0
Total | 0.1 | 0.0
Other Mortgage- and Asset-backed |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months | 4.5 |
12 Months or Longer | 0.0 |
Total | 4.5 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
12 Months or Longer | 0.0 |
Less Than 12 Months | 0.0 |
Total | 0.0 |
Investments in Fixed Maturities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less Than 12 Months | 1,403.2 | 482.9
12 Months or Longer | 326.6 | 438.9
Total | 1,729.8 | 921.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
12 Months or Longer | 19.5 | 13.9
Less Than 12 Months | 28.5 | 5.6
Total | $ 48.0 | $ 19.5

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