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Operating Leases - Schedule of Operating Leases Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating lease liabilities	$ (12.4)	$ (11.2)	$ (15.5)	$ (15.5)	$ (17.5)
Asset obtained in exchange for operating lease liability			0.2	1.9	23.9
Reduction of right-of use assets resulting from reductions to lease obligations			$ 0.1	$ 7.0	$ 2.3
Operating lease, weighted average remaining lease term (years(			7 years 3 months 18 days	8 years 1 month 6 days	8 years 9 months 18 days
Operating lease, weighted average discount rate (percent)			5.00%	5.00%	5.00%

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-5

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
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-URI https://asc.fasb.org//1943274/2147479589/842-20-55-53

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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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-Topic 842
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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-Topic 842
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