Leases (Lease Cost) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating lease cost	$ 57.2	$ 51.2
Variable lease cost	2.3	1.7
Short-term lease cost	24.1	17.5
Amortization of lease assets	0.7	1.0
Interest on lease liabilities	0.2	0.2
Total lease cost	$ 84.5	$ 71.6