Leases - Components of Lease Expense (Includes Related Party Leases) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lease, Cost [Abstract]
Operating lease expense	$ 27.0	$ 25.1	$ 23.3
Short-term lease expense	5.0	4.4	4.3
Low-value lease expense	0.9	0.5	0.6
Variable lease expense	9.0	6.6	1.5
Finance lease expense:
Amortization of right-of-use assets	6.5	4.0	2.0
Interest on lease liabilities	2.6	1.0	0.4
Sublease income	(0.3)	(0.1)	(0.1)
Total lease expense	$ 50.7	$ 41.5	$ 32.0