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Investments - Continuous Unrealized Loss (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
U.S. Government and Government Agencies and Authorities
Fair Value
Less Than 12 Months	$ 21.0	$ 10.5
12 Months or Longer	0.1	0.0
Total	21.1	10.5
Unrealized Losses
Less Than 12 Months	(1.3)	(0.1)
12 Months or Longer	0.0	0.0
Total	(1.3)	(0.1)
States and Political Subdivisions
Fair Value
Less Than 12 Months	335.7	23.3
12 Months or Longer	0.7	0.0
Total	336.4	23.3
Unrealized Losses
Less Than 12 Months	(11.6)	(0.2)
12 Months or Longer	0.0	0.0
Total	(11.6)	(0.2)
Foreign Governments
Fair Value
Less Than 12 Months	0.2	0.5
12 Months or Longer	2.2	2.6
Total	2.4	3.1
Unrealized Losses
Less Than 12 Months	(0.1)	(0.1)
12 Months or Longer	(1.1)	(1.0)
Total	(1.2)	(1.1)
Bonds and Notes
Fair Value
Less Than 12 Months	559.1	132.9
12 Months or Longer	59.6	46.1
Total	618.7	179.0
Unrealized Losses
Less Than 12 Months	(25.8)	(7.5)
12 Months or Longer	(4.6)	(3.1)
Total	(30.4)	(10.6)
Redeemable Preferred Stocks
Fair Value
Less Than 12 Months	5.4
12 Months or Longer	0.0
Total	5.4
Unrealized Losses
Less Than 12 Months	(0.1)
12 Months or Longer	0.0
Total	(0.1)
Collateralized Loan Obligations
Fair Value
Less Than 12 Months	42.1	145.2
12 Months or Longer	320.8	371.4
Total	362.9	516.6
Unrealized Losses
Less Than 12 Months	(0.2)	(3.8)
12 Months or Longer	(10.3)	(15.9)
Total	(10.5)	(19.7)
Other Mortgage- and Asset-backed
Fair Value
Less Than 12 Months	17.3	6.3
12 Months or Longer	0.1	0.0
Total	17.4	6.3
Unrealized Losses
Less Than 12 Months	(0.1)	0.0
12 Months or Longer	0.0	0.0
Total	(0.1)	0.0
Investments in Fixed Maturities
Fair Value
Less Than 12 Months	980.8	318.7
12 Months or Longer	383.5	420.1
Total	1,364.3	738.8
Unrealized Losses
Less Than 12 Months	(39.2)	(11.7)
12 Months or Longer	(16.0)	(20.0)
Total	(55.2)	(31.7)
Investments in Fixed Maturities | Non-investment-grade
Unrealized Losses
Total	$ (15.4)	$ (23.7)

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