Leases (Tables)

12 Months Ended

Dec. 31, 2020

Leases [Abstract]

Schedule of Leases

Leases	Classification	December 31, 2020		December 31, 2019
Assets		(in millions)
Operating	Operating lease right-of-use assets	$	70.9	$	158.4
Finance	Property and equipment (including Concession assets), net	5.7		8.7
Total leased assets		$	76.6	$	167.1
Liabilities
Current
Operating	Accounts payable and accrued liabilities	$	24.6	$	45.4
Finance	Long-term debt due within one year	2.3		1.9
Noncurrent
Operating	Long-term operating lease liabilities	45.4		85.7
Finance	Long-term debt	5.2		6.8
Total lease liabilities		$	77.5	$	139.8

Schedule of Lease Cost Components

		Years ended
Lease Cost	Classification	December 31, 2020		December 31, 2019
Operating lease cost:		(in millions)
	Equipment costs	$	23.3	$	43.0
	Materials and other	5.0		10.7
Finance lease cost:
Amortization of finance lease assets	Depreciation and amortization	1.6		2.7
Interest on lease liabilities	Interest expense	0.9		1.1
Total lease cost		$	30.8	$	57.5

Schedule of Cash Flow Information

	Years ended
Cash Flow Information	December 31, 2020		December 31, 2019
	(in millions)
Cash paid for operating leases included in operating activities	$	45.6	$	58.7
Cash paid for finance leases included in operating activities	0.9		1.1
Cash paid for finance leases included in financing activities	2.0		2.7
Right-of-use assets obtained in exchange for operating lease liabilities	18.4		35.2
Right-of-use assets obtained in exchange for financing lease liabilities	0.8		—

Schedule of Lease Term and Discount Rate

Lease Term and Discount Rate	December 31, 2020		December 31, 2019
Weighted-average remaining lease term (years)
Operating leases	3.7		4.9
Finance leases	3.1		3.9
Weighted-average discount rate
Operating leases	3.1	%	3.9	%
Finance leases	11.4	%	11.1	%

Schedule of Remaining Maturities of Lease Liabilities

Remaining Maturities of Lease Liabilities Year Ending December 31 (in millions),	Operating Leases		Finance Leases
2021	$	26.6	$	2.9
2022	18.5		2.9
2023	12.6		2.6
2024	10.3		0.3
2025	3.4		—
Thereafter	3.1		—
Total lease payments	74.5		8.7
Less imputed interest	4.5		1.2
Total	$	70.0	$	7.5