Lease assets and liabilities, lessee (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 1,513.0	$ 1,503.8
Short-term operating lease liabilities	179.0	168.7
Non-current operating lease liabilities	$ 1,361.0	$ 1,351.8
Weighted-average remaining lease term	10 years 8 months 12 days	10 years 9 months 18 days
Weighted-average discount rate	6.50%	6.40%