Investments - Schedule of Major Industry Types of Fixed Maturity Holdings (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,824.0
Fair Value	3,753.0	$ 4,028.9
Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,600.4	2,569.1
Fair Value	$ 2,614.9	$ 2,827.0
Percentage of Total	100.00%	100.00%
Finance, insurance, and real estate \| Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 626.3	$ 632.2
Fair Value	$ 585.6	$ 674.9
Percentage of Total	22.40%	23.80%
Transportation, communication and other services \| Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 794.8	$ 785.7
Fair Value	$ 752.8	$ 855.2
Percentage of Total	28.80%	30.30%
Manufacturing \| Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 707.2	$ 728.7
Fair Value	$ 782.1	$ 825.9
Percentage of Total	29.90%	29.20%
Other \| Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 472.1	$ 422.5
Fair Value	$ 494.4	$ 471.0
Percentage of Total	18.90%	16.70%

Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, Before Tax, Percentage of Total

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942338&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562

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-Name Accounting Standards Codification
-Topic 320
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