Leases - Summary of Lease Cost (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
Leases [Abstract]
Operating lease cost	[1]	$ 19.8	$ 27.2
Short-term cost	[2]	6.8	4.9
Variable lease cost	[2]	1.7	4.7
Total lease cost		$ 28.3	$ 36.8

[1] Operating lease cost represents non-cash amortization of ROU assets and accretion of the discounted lease liabilities and is segregated on the statements of consolidated cash flows.

[2] These operating expenses are classified and recorded primarily within purchased transportation.