Goodwill and Other Intangible Assets, Amortization (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Intangible assets
Amortization expense	$ 32.6	$ 12.5	$ 44.9	$ 25.4
Amortization expense estimated for each of the next five fiscal years
Remainder of 2021	32.1		32.1
2022	57.5		57.5
2023	54.7		54.7
2024	48.9		48.9
2025	39.5		39.5
2026	37.8		37.8
MTS Sensors [Member] \| Backlog
Intangible assets
Amortization expense	$ 16.2		$ 16.2

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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+ References

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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