Basis of Presentation - Additional Information (Details) - USD ($) $ in Millions		2 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 19, 2021	Mar. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Estimated average life			14 years 1 month 6 days				14 years 8 months 12 days
Goodwill		$ 1,086.5	$ 1,086.5		$ 1,086.5		$ 1,009.5
Sales			1,889.0	$ 1,796.7	3,465.5	$ 3,491.8
CON-E-CO
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Sales				$ 6.8		$ 17.1
Pratt Miller
Organization, Consolidation and Presentation of Financial Statements [Line Items]
Purchase price	$ 116.1
Consideration paid in cash	112.1
Receivable for post-closing working capital adjustments	3.0
Contingent cash consideration	7.0
Sales of acquiree		$ 17.7
Preliminary valuation of intangible assets	$ 32.3
Estimated average life	7 years
Goodwill	$ 75.4
Goodwill deductible for income tax purposes	$ 67.2
Transaction costs related to acquisition			$ 0.3		$ 1.0