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Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Oct. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue	$ 693.7	$ 607.5	$ 648.9	$ 566.9	$ 485.8	$ 446.6	$ 464.6	$ 410.3	$ 2,517.0	$ 1,807.3	$ 1,770.1
Retained earnings	481.4				599.5				481.4	599.5		$ 531.2
Receivables from long-term manufacturing contracts	138.1				180.3				138.1	180.3		122.2
Inventories	385.4				157.7				385.4	157.7		170.9
Deferred income taxes	185.8				61.6				185.8	61.6		76.5
Cost of Goods and Services Sold									1,703.7	1,184.3	1,128.0
Gross profit	$ 240.5	$ 207.3	$ 193.7	$ 171.8	166.7	$ 148.4	$ 160.9	$ 147.0	813.3	623.0	642.1
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest									(18.5)	176.7	146.5
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										176.7
Consolidated net (loss) income									$ (53.4)	126.2	81.2
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue										1,807.3
Retained earnings					599.3					599.3	531.0
Receivables from long-term manufacturing contracts					178.4					178.4	120.3
Inventories					159.4					159.4	172.5
Deferred income taxes					61.6					61.6	$ 76.4
Cost of Goods and Services Sold										1,184.3
Gross profit										623.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										176.7
Consolidated net (loss) income										126.2
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenue										0.0
Retained earnings					(0.2)					(0.2)		0.2
Receivables from long-term manufacturing contracts					(1.9)					(1.9)		1.9
Inventories					1.7					1.7		(1.6)
Deferred income taxes					$ 0.0					0.0		$ 0.1
Cost of Goods and Services Sold										0.0
Gross profit										0.0
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest										0.0
Consolidated net (loss) income										$ 0.0