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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets
Gross carrying amount	$ 203.5		$ 203.5		$ 204.0
Accumulated amortization	58.2		58.2		46.6
Intangible assets, net	177.3		177.3		189.4
Amortization expense	5.7	$ 2.9	11.6	$ 5.8
2023	11.4		11.4
2024	22.4		22.4
2025	16.5		16.5
2026	16.5		16.5
2027	15.8		15.8
Finite-Lived Intangible Asset, Expected Amortization, after Year Five	62.7		62.7
Finite-Lived Intangible Assets, Net	145.3		145.3
Proceeds from Sale of Other Assets			7.2	$ 0.0
Payments for Commissions			1.8
Asset at Fair Value, Changes in Fair Value Resulting from Changes in Assumptions			0.5
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	16.0		16.0		16.0
Accumulated amortization	1.8		1.8		1.2
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	120.6		120.6		121.1
Accumulated amortization	22.5		22.5		16.0
Unpatented Technology [Member]
Finite-Lived Intangible Assets
Gross carrying amount	64.5		64.5		64.5
Accumulated amortization	31.9		31.9		27.4
Other
Finite-Lived Intangible Assets
Gross carrying amount	2.4		2.4		2.4
Accumulated amortization	$ 2.0		$ 2.0		$ 2.0

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- Definition

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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Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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The cash inflow from disposal of asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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