Share-based Payments (Compensation Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Total compensation costs related to share based payments	$ 20.0	$ 14.1	$ 35.1	$ 26.8
Selling, general and administrative:
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock option compensation expense	0.8	1.6	2.3	4.3
Equity-classified share units	17.3	9.4	25.6	12.9
Liability-classified share units	0.2	0.5	1.5	0.5
Employee share purchase plan	1.7	0.8	4.6	1.3
Total compensation costs related to share based payments	20.0	12.3	34.0	19.0
Acquisition-related and integration costs:
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Acceleration of share-based payments expense	0.0	0.9	0.9	5.9
Share-based continuing employment costs	0.0	0.9	0.2	1.9
Total compensation costs related to share based payments	$ 0.0	$ 1.8	$ 1.1	$ 7.8