Lease Obligations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Finance leases, assets, gross	$ 651.1		$ 653.5
Finance Lease, Liability, Statement of Financial Position [Extensible List]	Property and equipment, net		Property and equipment, net
Finance leases, assets, net	$ 458.3		$ 468.5
Finance leases, assets, depreciation	20.3	$ 19.0
Operating leases, additions	26.9	5.5
Operating leases, expense	34.0	27.4
Operating leases, variable lease costs	3.0	2.2
Operating leases, short-term leases, expense	$ 74.3	$ 110.1
Finance leases, weighted average remaining lease term (in years)	2 years 8 months 12 days
Finance leases, weighted average discount rate, percent	3.20%
Operating leases, weighted average remaining lease term (in years)	4 years 4 months 24 days
Operating leases, weighted average discount rate, percent	2.80%
Leases not yet commenced, undiscounted amount	$ 7.3
Minimum
Lessee, Lease, Description [Line Items]
Operating leases, term of contract (in years)	1 year
Leases not yet commenced, term of contract	1 year
Minimum | Equipment Leases
Lessee, Lease, Description [Line Items]
Leases, renewal term	1 year
Minimum | Facility Leases
Lessee, Lease, Description [Line Items]
Leases, renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Leases, remaining lease terms	11 years
Operating leases, term of contract (in years)	1 year
Leases not yet commenced, term of contract	11 years
Maximum | Equipment Leases
Lessee, Lease, Description [Line Items]
Leases, renewal term	5 years
Maximum | Facility Leases
Lessee, Lease, Description [Line Items]
Leases, renewal term	5 years