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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Sep. 30, 2021	Jun. 30, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Unrealized investment loss (gain)					$ 66.4	$ (43.4)	$ 0.0
Franchise value, impairment	$ 1.9	$ 4.4	$ 0.4		1.9	4.4
Reductions from impairments		$ 3.5	$ 1.7			3.5
Asset impairments				$ 0.5	$ 1.9	$ 7.9	$ 2.6

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- Definition

Franchise Value, Impairment

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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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.

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Amount of unrealized gain (loss) on investment.

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