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	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible assets
Amortization expense	$ 49.6	$ 67.3	$ 46.9
Amortization expense estimated for each of the next five fiscal years
2021	46.2
2022	38.5
2023	35.7
2024	30.0
2025	$ 20.5
Backlog
Intangible assets
Amortization expense		15.7
SSI Controls Technologies \| Backlog
Intangible assets
Amortization expense		$ 12.5