Goodwill and Other Identifiable Intangible Assets - Indefinite-life Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]
Amortization	$ 16.1	$ 15.4	$ 48.1	$ 45.6
Cost	1,499.2		1,499.2		$ 1,494.0
Accumulated amortization	(381.6)		(381.6)		(333.5)
Net	1,117.6		1,117.6		1,160.5
Trade names
Indefinite-lived Intangible Assets [Line Items]
Indefinite-life intangibles	$ 273.1		$ 273.1		$ 281.3

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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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.

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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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