Retirement Benefits - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) benefitPlan	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of defined contribution pension plans | benefitPlan	4
Defined contribution pension plans, total costs	$ 35.2	$ 36.7	$ 32.3
Number of multiemployer defined benefit pension plans | benefitPlan	0
Futures contract supported by cash or cash equivalents	100.00%
Company Stock
Defined Benefit Plan Disclosure [Line Items]
Employer stock included in plan assets	$ 0.0	$ 0.0
United States
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.50%	5.60%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Discount rate	5.55%	5.60%
Canada
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.86%	4.58%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	$ 636.2	$ 657.1	674.9
Settlement losses	$ 0.0	$ 0.0	$ 0.0
Discount rate	5.49%	5.58%	5.16%
Employer contributions	$ 48.8	$ 8.2
Pension Benefits | United States
Defined Benefit Plan Disclosure [Line Items]
Defined benefit obligation per plan, as a percent of total benefit obligation (as a percent)	89.00%
Employer contributions	$ 40.0
Pension Benefits | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1.4	$ 1.3