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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Goodwill and Other Intangible Assets, Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Intangible assets
Amortization expense	$ 18.1	$ 21.9	$ 59.4	$ 56.7
Amortization expense estimated for each of the next five fiscal years
Remainder of 2023	23.9		23.9
2024	70.2		70.2
2025	60.8		60.8
2026	59.2		59.2
2027	52.5		52.5
2028	$ 45.2		45.2
2022 Acquisitions [Member] \| Backlog
Intangible assets
Amortization expense		$ 5.0		$ 5.0
2023 Acquisitions [Member] \| Backlog
Intangible assets
Amortization expense			$ 5.4