Goodwill and Other Identifiable Intangible Assets - Indefinite-life Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Indefinite-lived Intangible Assets [Line Items]
Amortization	$ 41.9	$ 26.8	$ 106.0	$ 66.7
Cost	2,522.0		2,522.0		$ 2,084.1
Accumulated amortization	(605.1)		(605.1)		(497.1)
Net	1,916.9		1,916.9		1,587.0
Trade names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-life intangibles	$ 367.6		$ 367.6		$ 370.5

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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