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Other Assets and Receivables (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investment in Qualified Affordable Housing Limited Partnerships
Investments for qualified affordable housing limited partnerships	$ 131.4	$ 73.0
Additional contribution on qualified affordable housing limited partnerships	61.4	36.8
Amortization expense	7.9	2.1	$ 2.0
Tax credit	8.4	2.1	$ 2.0
Joint Ventures
Investments in debt funds	33.2	29.8
Joint venture investments	11.0
Additional investment in joint ventures	4.0	3.5
Corporate Joint Venture
Joint Ventures
Investment in joint ventures	$ 52.2	$ 37.5

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- Definition

The amount of additional investment expected in future period as at the end of the reporting period.

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The amount of investment in debt funds as at the end of the reporting period.

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- Definition

The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Publisher FASB
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- Definition

Amount of investment in qualified affordable housing projects.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 323
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481543/323-740-50-2

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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-Name Accounting Standards Codification
-Section 45
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-URI https://asc.fasb.org//1943274/2147481664/323-10-45-1

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The amount deducted from an entities' taxes, reflecting a percentage of an amount invested in certain assets spread over the useful life of those assets; includes deferred investment tax credits.

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The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group.

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- Definition

Amount of commitment or contingent commitments to qualified affordable housing project investments.

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Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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