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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Postemployment Benefits [Abstract]
Expenses relating to defined contribution plans	$ 72.4	$ 65.4	$ 57.9
Projected benefit plan obligations of Terra Nova Pension Plan	105.4	117.3
Fair value of Terra Nova Pension Plan assets	$ 168.8	$ 184.6

X

- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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X

- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
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-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

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X

- Definition

Amount of cost for defined contribution plan.

+ References

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- References

No definition available.

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