Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net income	$ 281.6	$ 228.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	159.7	150.0
Deferred income taxes	99.2	77.7
Equity in net earnings of affiliates	(6.9)	(6.9)
Share-based compensation	10.5	11.1
Distributions from unconsolidated affiliates	5.0	5.0
Settlement of foreign currency derivative instruments	(23.7)	(58.4)
(Gain) loss on foreign currency derivative instruments	(42.2)	19.7
Mexican fuel excise tax credit	(24.5)	(34.0)
Changes in working capital items:
Accounts receivable	(42.2)	(5.0)
Materials and supplies	(3.3)	(1.7)
Other current assets	(20.7)	7.4
Accounts payable and accrued liabilities	34.0	26.3
Other, net	(9.6)	(1.7)
Net cash provided by operating activities	416.9	418.1
Investing activities:
Capital expenditures	(285.4)	(258.5)
Purchase or replacement of equipment under operating leases	(21.9)	(5.4)
Property investments in MSLLC	(19.7)	(16.6)
Proceeds from disposal of property	5.5	2.0
Other, net	(15.9)	(4.8)
Net cash provided (used)	(337.4)	(283.3)
Financing activities:
Proceeds from short-term borrowings	5,901.5	6,498.7
Repayment of short-term borrowings	(5,781.9)	(6,579.0)
Proceeds from issuance of long-term debt	0.0	248.7
Repayment of long-term debt	(12.7)	(13.0)
Dividends paid	(70.3)	(71.6)
Shares repurchased	(120.4)	(59.2)
Debt costs	0.0	(2.6)
Proceeds from employee stock plans	0.0	0.2
Net cash provided by (used for) financing activities	(83.8)	22.2
Cash and cash equivalents:
Net increase (decrease) during each period	(4.3)	157.0
At beginning of year	170.6	136.6
At end of period	$ 166.3	$ 293.6