Leases (Breakdown of Lease Expense) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease cost	$ 59.9	$ 6.1	$ 132.1	$ 17.1
Finance lease cost
Amortization of leased assets	2.6	2.5	8.5	7.7
Interest on lease liabilities	0.3	0.2	0.9	0.5
Short-term lease cost	4.7	2.8	12.4	9.2
Sublease income	0.0	0.0	(0.1)	0.0
Lease expense	$ 67.5	$ 11.6	$ 153.8	$ 34.5