Retirement Benefits - Narrative (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) benefitPlan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) benefitPlan
Defined Benefit Plan Disclosure [Line Items]
Pension charge		$ 0.0	$ 0.0	$ 7.0
Number of defined contribution pension plans | benefitPlan		4
Defined contribution pension plans, total costs		$ 36.7	32.3	$ 25.8
Number of multiemployer defined benefit pension plans | benefitPlan		0		1
Multiemployer plan total employer contributions				$ 0.2
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		5.60%	5.20%
United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Discount rate		5.60%	4.80%
Canada
Defined Benefit Plan Disclosure [Line Items]
Discount rate		4.58%	4.61%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Pension charge		$ 13.5	$ 18.5	18.1
Benefit obligation		657.1	674.9	670.8
Settlement losses		$ 0.0	$ 0.0	$ 8.8
Discount rate		5.58%	5.16%	5.46%
Employer contributions		$ 8.2	$ 26.5
Pension Benefits | Continuing Operations
Defined Benefit Plan Disclosure [Line Items]
Settlement losses				$ 7.0
Pension Benefits | Discontinued Operations
Defined Benefit Plan Disclosure [Line Items]
Settlement losses				1.8
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)		90.00%
Employer contributions			$ 20.0	10.0
Pension Benefits | United States | Subsequent Event
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 20.0
Pension Benefits | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Employer contributions		$ 1.3		$ 2.5