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Investments (Continuous unrealized loss) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
U.S. Government and Government Agencies and Authorities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Less Than 12 Months | 594.0 | 140.0
12 Months or Longer | $ 56.5 | $ 103.4
Total | 650.5 | 243.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 20.0 | 1.1
12 Months or Longer | 8.4 | 5.1
Total | $ 28.4 | $ 6.2
States and Political Subdivisions |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Less Than 12 Months | 486.4 | 57.0
12 Months or Longer | $ 0.0 | $ 124.2
Total | 486.4 | 181.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 14.6 | 0.3
12 Months or Longer | 0.0 | 2.0
Total | $ 14.6 | $ 2.3
Foreign Governments |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Less Than 12 Months | 4.8 |
12 Months or Longer | $ 0.0 |
Total | 4.8 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 0.5 |
12 Months or Longer | 0.0 |
Total | $ 0.5 |
Bonds and Notes |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Less Than 12 Months | 1,237.5 | 283.1
12 Months or Longer | $ 302.3 | $ 208.9
Total | 1,539.8 | 492.0
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 32.2 | 4.2
12 Months or Longer | 9.7 | 6.8
Total | $ 41.9 | $ 11.0
Collateralized Loan Obligations |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Less Than 12 Months | 204.6 | 2.8
12 Months or Longer | $ 0.0 | $ 2.4
Total | 204.6 | 5.2
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 1.0 | 0.0
12 Months or Longer | 0.0 | 0.0
Total | $ 1.0 | $ 0.0
Other Mortgage- and Asset-backed |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Less Than 12 Months | 7.5 |
12 Months or Longer | $ 0.0 |
Total | 7.5 |
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 0.1 |
12 Months or Longer | 0.0 |
Total | $ 0.1 |
Investments in Fixed Maturities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Less Than 12 Months | 2,534.8 | 482.9
12 Months or Longer | $ 358.8 | $ 438.9
Total | 2,893.6 | 921.8
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less Than 12 Months | 68.4 | 5.6
12 Months or Longer | 18.1 | 13.9
Total | $ 86.5 | $ 19.5

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