Summary of Significant Accounting Policies - Goodwill and Other Indefinite-Lived Intangible Assets (Details) $ in Millions	12 Months Ended
Dec. 31, 2023 USD ($) segment item	Dec. 31, 2022 USD ($) segment item	Dec. 31, 2021 USD ($) segment item
Goodwill and Other Indefinite-Lived Intangible Assets
Number of operating segments \| segment	1	1	1
Number of reportable segments \| item	1	1	1
Impairment of goodwill	$ 0.0	$ 0.0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	$ 0.0	$ 0.0	$ 4.7

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- Definition

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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