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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Amount of expense for amortization of capitalized computer software costs.

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Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 14.4	$ 14.7	$ 43.3	$ 45.4
External-use software, net	6.3		6.3
Amortization costs of external-use software	$ 0.3		$ 1.4
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	4 years		4 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life	50 years		50 years