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Nature of Operations - Summary of Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions	Sep. 30, 2021	Jan. 19, 2021	Sep. 30, 2020	Sep. 30, 2019
Assets Acquired:
Goodwill	$ 1,052.0		$ 1,009.5	$ 995.7
Pratt Miller
Assets Acquired:
Current assets, excluding cash of $4.9		$ 15.4
Property, plant and equipment		7.8
Goodwill	$ 44.4	44.4
Purchased intangible assets		57.9
Other long-term assets		5.8
Total assets		131.3
Liabilities Assumed:
Current liabilities		15.1
Long-term liabilities		4.8
Total liabilities		19.9
Net assets acquired		$ 111.4

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