CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net income (loss)	$ 6.2	$ (307.4)	$ (5.2)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	91.1	132.2	114.4
Amortization of intangible assets	7.2	14.3	16.7
Amortization of deferred financing fees	4.3	3.5	2.9
Non-cash operating lease expense	(8.0)	27.2
Non-cash adjustments to contingent consideration	(13.9)
Write-off of deferred financing fees		2.3
Stock-based compensation expense	5.9	3.8	3.6
Deferred taxes	(0.1)	(59.8)	(19.8)
Bad debt expense	1.2	3.7	1.1
Gain on disposition of property and equipment	(6.9)	(5.2)	(4.0)
Deferred gain recognized on sales-type leases			(2.4)
Impairment	15.4	312.8	13.9
Changes in operating assets and liabilities
Accounts receivable	42.2	8.2	(33.2)
Drivers' advances and other receivables		(2.6)
Payments received on sales-type leases			14.7
Other current assets	(0.6)	(1.8)	(4.2)
Accounts payable	(4.1)	(1.8)	(8.9)
Accrued expenses and other liabilities	5.0	(15.3)	15.7
Net cash provided by operating activities	144.9	114.1	105.3
Cash flows from investing activities
Purchase of property and equipment	(37.2)	(22.0)	(66.4)
Proceeds from sale of property and equipment	68.8	37.8	26.3
Cash paid in acquisitions, net of cash acquired			(131.7)
Net cash provided by (used in) investing activities	31.6	15.8	(171.8)
Cash flows from financing activities:
Advances on line of credit	1,484.7	1,357.0	1,101.2
Repayments on line of credit	(1,486.4)	(1,355.3)	(1,105.8)
Principal payments on long-term debt	(82.2)	(76.0)	(58.6)
Proceeds from long-term debt			6.1
Payment of contingent consideration	(7.6)
Deferred financing fees		(0.3)	(1.5)
Proceeds from issuance of common stock			84.4
Net cash provided by (used in) financing activities	(96.4)	(79.6)	20.9
Effect of exchange rates on cash and cash equivalents	0.4	(0.6)	0.9
Net increase (decrease) in cash and cash equivalents	80.5	49.7	(44.7)
Cash and cash equivalents - beginning of year	95.7	46.0	90.7
Cash and cash equivalents - end of year	176.2	95.7	46.0
Supplemental disclosure of cash flow information
Cash paid for interest	40.6	46.7	42.7
Cash paid for income taxes	3.5	3.6	2.4
Noncash investing and financing activities
Property and equipment acquired with debt or finance lease obligations	58.3	72.7	89.6
Accrued capital expenditures			0.3
Property and equipment sold for notes receivable	0.3	0.4	0.8
Property and equipment transferred to sales-type lease			9.4
Sales-type lease returns to property and equipment			1.3
Sales-type lease assets acquired with debt or capital lease obligations			9.9
Sales-type lease assets sold for notes receivable			57.6
Sales-type lease returns to sales-type lease assets			32.9
Common stock issued in acquisitions			19.7
Issuance of earnout shares			48.2
Right-of-use assets acquired	54.6	39.2
Series A
Cash flows from financing activities:
convertible preferred stock dividends	$ (4.9)	$ (5.0)	$ (4.9)