Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating Activities:
Net income	$ 161.3	$ 90.3
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	146.3	142.1
(Gains) losses on sales of property and equipment—net	(16.0)	3.8
Proceeds from lease receipts	35.3	35.7
Deferred income taxes	19.3	2.8
Long-term incentive and share-based compensation expense	8.2	3.4
Gains on investment in equity securities	(20.2)	(8.8)
Noncash restructuring—net	0.0	(0.8)
Other noncash items	1.6	5.7
Changes in operating assets and liabilities:
Receivables	(61.7)	34.7
Other assets	(50.6)	(36.5)
Payables	40.7	12.1
Claims reserves and other receivables—net	(1.0)	8.6
Other liabilities	(8.2)	26.7
Net cash provided by operating activities	255.0	319.8
Investing Activities:
Purchases of transportation equipment	(153.6)	(83.3)
Purchases of other property and equipment	(22.5)	(25.0)
Proceeds from sale of property and equipment	76.6	29.6
Proceeds from sale of off-lease inventory	9.1	9.0
Purchases of lease equipment	(36.5)	(41.7)
Proceeds from marketable securities	8.6	10.2
Purchases of marketable securities	(11.6)	(8.9)
Investment in equity securities	(5.0)	0.0
Net cash used in investing activities	(134.9)	(110.1)
Financing Activities:
Payments of debt and finance lease obligations	(0.3)	(25.3)
Dividends paid	(24.8)	(22.2)
Net cash used in financing activities	(25.1)	(47.5)
Net increase in cash and cash equivalents	95.0	162.2
Cash and Cash Equivalents:
Beginning of period	395.5	551.6
End of period	490.5	713.8
Noncash investing and financing activity:
Equipment and inventory purchases in accounts payable	51.5	20.9
Dividends declared but not yet paid	13.9	11.8
Cash paid during the period for:
Interest	5.8	6.6
Income taxes—net of refunds	$ 39.5	$ 2.6