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Investments - Equity Method Investments (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Jan. 01, 2017	Mar. 31, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity Method Investment, Aggregate Cost [Roll Forward]
Equity method investments, opening balance			$ 7.6	$ 6.2
Investment in the period			0.0	0.4	$ 2.0
Equity method investments, closing balance			7.3	7.6	6.2
Equity Method Investments
Equity Method Investment, Aggregate Cost [Roll Forward]
Unrealized (loss)/gain			(0.1)	1.0
Realized (loss) for the twelve months to December 31, 2024			(0.2)
MVI
Equity Method Investment, Aggregate Cost [Roll Forward]
Equity method investments, opening balance			1.0	0.8
Investment in the period		$ 0.8		0.0	0.4
Equity method investments, closing balance			0.8	1.0	0.8
MVI | Equity Method Investments
Equity Method Investment, Aggregate Cost [Roll Forward]
Unrealized (loss)/gain			(0.2)	0.2
Realized (loss) for the twelve months to December 31, 2024			0.0
Multi-Line Insurer
Equity Method Investment, Aggregate Cost [Roll Forward]
Equity method investments, opening balance			6.4	5.2
Investment in the period			0.0	0.4
Equity method investments, closing balance			6.5	6.4	5.2
Multi-Line Insurer | Equity Method Investments
Equity Method Investment, Aggregate Cost [Roll Forward]
Unrealized (loss)/gain			0.1	0.8
Realized (loss) for the twelve months to December 31, 2024			0.0
Digital Re
Equity Method Investment, Aggregate Cost [Roll Forward]
Equity method investments, opening balance			0.2	0.2
Investment in the period	$ 2.3			0.0
Equity method investments, closing balance			0.0	0.2	$ 0.2
Digital Re | Equity Method Investments
Equity Method Investment, Aggregate Cost [Roll Forward]
Unrealized (loss)/gain			0.0	$ 0.0
Realized (loss) for the twelve months to December 31, 2024			$ (0.2)

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- Definition

Equity Method Investment, Aggregate Cost [Roll Forward]

+ References

No definition available.

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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 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

+ References

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Amount of realized gain (loss) on investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Amount of unrealized gain (loss) on investment.

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