Investments - Schedule of Major Industry Types of Fixed Maturity Holdings (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 3,745.3
Fair Value	4,028.9	$ 3,391.6
Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,569.1	2,311.0
Fair Value	$ 2,827.0	$ 2,244.5
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	$ 632.2	$ 469.0
Fair Value	$ 674.9	$ 452.9
Percentage of Total	23.80%	20.20%
Transportation, communication and other services \| Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 785.7	$ 758.6
Fair Value	$ 855.2	$ 734.0
Percentage of Total	30.30%	32.70%
Manufacturing \| Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 728.7	$ 712.7
Fair Value	$ 825.9	$ 693.5
Percentage of Total	29.20%	30.90%
Other \| Corporate And Other Fixed Maturities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 422.5	$ 370.7
Fair Value	$ 471.0	$ 364.1
Percentage of Total	16.70%	16.20%

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
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-Name Accounting Standards Codification
-Topic 320
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