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Goodwill and Intangible Assets - Summary of Finite-Lived Intangible Assets (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
At inception	$ 174.5
Accumulated amortization	(30.1)
Total	$ 144.4
Weighted Average useful Life (in Years)	23 years
Value of business acquired
Finite-Lived Intangible Assets [Line Items]
At inception	$ 94.4
Accumulated amortization	$ (12.6)
Weighted Average useful Life (in Years)	30 years
Value of distribution acquired
Finite-Lived Intangible Assets [Line Items]
At inception	$ 54.0
Accumulated amortization	$ (9.4)
Weighted Average useful Life (in Years)	17 years
Value of agency relationships
Finite-Lived Intangible Assets [Line Items]
At inception	$ 17.0
Accumulated amortization	$ (4.6)
Weighted Average useful Life (in Years)	14 years
Value of customer relationships
Finite-Lived Intangible Assets [Line Items]
At inception	$ 9.1
Accumulated amortization	$ (3.5)
Weighted Average useful Life (in Years)	10 years

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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-Topic 350
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-Section 50
-Paragraph 2
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 926
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959

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