BorgWarner Inc. and Consolidated Subsidiaries Consolidated Statements of Cash Flows - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
OPERATING
Net earnings		$ 483.3	$ 160.2	$ 646.4
Adjustments to reconcile net earnings to net cash flows from operations:
Asset impairment and loss on divestiture		71.0	127.1	0.0
Asbestos-related charge		0.0	703.6	0.0
Gain on previously held equity interest		0.0	0.0	(10.8)
Pension settlement loss		0.0	0.0	25.7
Depreciation and amortization		407.8	391.4	320.2
Stock-based compensation expense		52.7	43.6	40.2
Restructuring expense, net of cash paid		27.0	12.0	36.3
Deferred income tax provision (benefit)		41.8	(268.9)	13.3
Tax reform adjustments to provision for income taxes		273.5	0.0	0.0
Equity in affiliates’ earnings, net of dividends received, and other		(32.0)	(17.0)	(21.9)
Net earnings adjusted for non-cash charges to operations		1,325.1	1,152.0	1,049.4
Changes in assets and liabilities:
Receivables		(167.9)	(137.5)	(81.8)
Inventories		(84.5)	(36.5)	(52.9)
Prepayments and other current assets		0.5	8.8	(9.4)
Accounts payable and accrued expenses		232.8	134.9	23.1
Income taxes payable		(42.8)	(14.2)	34.6
Other assets and liabilities		(82.9)	(71.8)	(95.1)
Net cash provided by operating activities		1,180.3	1,035.7	867.9
INVESTING
Capital expenditures, including tooling outlays	[1]	(560.0)	(500.6)	(577.3)
Proceeds from divestiture of businesses, net of cash divested		0.0	85.8	0.0
Proceeds from asset disposals and other		4.5	10.6	4.7
Payments for businesses acquired, including restricted cash, net of cash acquired		(185.7)	0.0	(1,199.6)
(Payments for) proceeds from settlement of net investment hedges		(8.5)	0.0	13.1
Payments for venture capital investment		(2.6)	0.0	0.0
Net cash used in investing activities		(752.3)	(404.2)	(1,759.1)
FINANCING
Net decrease in notes payable		(88.3)	(129.1)	(316.7)
Additions to long-term debt, net of debt issuance costs		3.0	4.6	1,569.2
Repayments of long-term debt, including current portion		(19.3)	(193.6)	(29.8)
Payments for debt issuance cost		(2.4)	0.0	0.0
Proceeds from interest rate swap termination		0.0	8.9	0.0
Payments for purchase of treasury stock		(100.0)	(288.0)	(349.8)
(Payments for) proceeds from stock-based compensation items		(2.1)	6.7	3.7
Dividends paid to BorgWarner stockholders		(124.1)	(113.4)	(116.7)
Dividends paid to noncontrolling stockholders		(29.3)	(29.9)	(23.3)
Net cash (used in) provided by financing activities		(362.5)	(733.8)	736.6
Effect of exchange rate changes on cash		36.1	(31.7)	(65.5)
Net increase (decrease) in cash		101.6	(134.0)	(220.1)
Cash at beginning of year		443.7	577.7	797.8
Cash at end of year		545.3	443.7	577.7
Net Cash Paid During Period For [Abstract]
Interest		92.0	100.3	70.2
Income taxes, net of refunds		279.8	300.5	183.8
Non Cash Investing Transactions [Abstract]
Liabilities assumed from business acquired		18.0	0.0	31.1
Non-cash financing transactions [Abstract]
Debt assumed from business acquired		$ 0.0	$ 0.0	$ 10.9

[1] Long-lived asset expenditures include capital expenditures and tooling outlays.