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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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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Goodwill and Other Intangible Assets, Amortization (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 agreement
Intangible assets
Amortization expense	$ 20.4	$ 23.2
Amortization expense estimated for each of the next five fiscal years
Remainder of 2024	57.6
2025	68.2
2026	66.6
2027	59.9
2028	52.5
2029	$ 41.9
2023 Acquisitions [Member]
Intangible assets
Number of acquisitions \| agreement			10
2023 Acquisitions [Member] \| Backlog
Intangible assets
Amortization expense		$ 5.4