Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Operating activities:
Net income	$ 293.6	$ 281.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	169.6	159.7
Deferred income taxes	31.5	99.2
Equity in net earnings of affiliates	(2.0)	(6.9)
Share-based compensation	11.6	10.5
Distributions from affiliates	2.5	5.0
Settlement of foreign currency derivative instruments	12.0	(23.7)
Gain on foreign currency derivative instruments	(4.1)	(42.2)
Mexican fuel excise tax credit	(17.2)	(24.5)
Deemed mandatory repatriation tax	(4.0)	0.0
Changes in working capital items:
Accounts receivable	(17.2)	(42.2)
Materials and supplies	1.8	(3.3)
Other current assets	(4.1)	(20.7)
Accounts payable and accrued liabilities	(41.0)	34.0
Other, net	(7.2)	(9.6)
Net cash provided by operating activities	425.8	416.9
Investing activities:
Capital expenditures	(267.3)	(285.4)
Purchase or replacement of equipment under operating leases	(98.9)	(21.9)
Property investments in MSLLC	(20.4)	(19.7)
Investments in and advances to affiliates	(6.3)	(6.6)
Proceeds from disposal of property	5.7	5.5
Other, net	3.0	(9.3)
Net cash provided (used)	(384.2)	(337.4)
Financing activities:
Proceeds from short-term borrowings	3,955.0	5,901.5
Repayment of short-term borrowings	(4,303.1)	(5,781.9)
Proceeds from issuance of long-term debt	499.4	0.0
Repayment of long-term debt	(76.0)	(12.7)
Dividends paid	(74.1)	(70.3)
Shares repurchased	(108.5)	(120.4)
Debt issuance and retirement costs paid	(8.0)	0.0
Proceeds from employee stock plans	0.7	0.0
Net cash used for financing activities	(114.6)	(83.8)
Cash and cash equivalents:
Net decrease during each period	(73.0)	(4.3)
At beginning of year	134.1	170.6
At end of period	$ 61.1	$ 166.3