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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Finite-Lived Intangible Assets
Gross carrying amount	$ 160.8		$ 160.8		$ 160.8
Accumulated amortization	43.5		43.5		35.4
Intangible assets, net	149.3		149.3		157.4
Amortization expense	4.1	$ 4.2	8.1	$ 8.6
2023	8.1		8.1
2024	16.0		16.0
2025	16.0		16.0
2026	15.2		15.2
2027	12.8		12.8
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	49.2		49.2
Finite-Lived Intangible Assets, Net	117.3		117.3
Proceeds from Sale of Other Assets			0.0	$ 7.2
Payments for Commissions			1.8
Trademarks
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	32.0		32.0		32.0
Trademarks
Finite-Lived Intangible Assets
Gross carrying amount	15.2		15.2		15.2
Accumulated amortization	2.3		2.3		1.7
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	118.5		118.5		118.5
Accumulated amortization	33.4		33.4		27.3
Unpatented Technology [Member]
Finite-Lived Intangible Assets
Gross carrying amount	26.3		26.3		26.3
Accumulated amortization	7.4		7.4		6.0
Other
Finite-Lived Intangible Assets
Gross carrying amount	0.8		0.8		0.8
Accumulated amortization	$ 0.4		$ 0.4		$ 0.4

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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