Goodwill and Other Identifiable Intangible Assets - Indefinite-life Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Indefinite-lived Intangible Assets [Line Items]
Amortization	$ 25.6	$ 17.6	$ 64.5	$ 53.1
Cost	2,136.9		2,136.9		$ 1,600.4
Accumulated amortization	(598.5)		(598.5)		(534.3)
Net	1,538.4		1,538.4		1,066.1
Trade names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-life intangibles	$ 375.4		$ 375.4		$ 273.1

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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