Stock-Based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	$ 5.7	$ 7.3	$ 11.6	$ 16.3
Tax benefit associated with stock-based compensation costs recognized	0.7	1.0	1.5	2.0
Equity Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	5.7	7.3	11.6	16.2
Liability Awards
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	0.0	0.0	0.0	0.1
Time-Vested Restricted Stock Units (TVUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	4.9	6.2	9.9	11.8
Performance-Based Restricted Stock Units (PSUs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	0.7	0.4	1.3	3.3
Stock Appreciation Rights (SARs)
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	0.1	0.7	0.4	1.2
Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServicesSold
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	0.9	0.6	1.7	1.2
Income Statement Location [Axis]: us-gaap:OtherOperatingIncomeExpenseNet
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	0.0	1.9	0.0	2.8
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	0.1	0.1	0.2	0.2
Income Statement Location [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total Stock-Based Compensation Expense	$ 4.7	$ 4.7	$ 9.7	$ 12.1

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
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+ References

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
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