Receivables - Schedule of Receivables (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Receivables [Abstract]
Trade receivables - U.S. government	$ 89.8		$ 67.7
Trade receivables - other	1,419.2		1,160.6
Other receivables	100.7		119.2
Total receivables, gross	1,609.7		1,347.5
Less allowance for doubtful accounts	(10.3)	$ (9.9)	(7.4)	$ (8.0)	$ (7.2)	$ (6.7)
Total receivables, net	$ 1,599.4		$ 1,340.1