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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (FY) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]                            
Net income attributable to Wabtec shareholders $ 87,739 $ 48,948 $ 67,399 $ 72,025 $ 73,889 $ 46,328 $ 82,428 $ 90,485 $ 94,163 $ 260,521 $ 213,313 $ 262,261 $ 304,887 $ 398,628
Foreign currency translation gain (loss) (44,253)   82,905             (159,064) 277,984 326,096 (93,684) (132,899)
Unrealized gain (loss) on derivative contracts (82)   15,021             (5,583) 18,400 9,799 305 (1,202)
Unrealized gain (loss) on pension benefit plans and post-retirement benefit plans (6,872)   27             3,363 (3,017) 2,845 (12,021) 26,689
Other comprehensive (loss) income before tax (51,207)   97,953             (161,284) 293,367 338,740 (105,400) (107,412)
Income tax (expense) benefit related to components of other comprehensive (loss) income 1,675   (5,333)             543 (5,692) (4,127) 2,514 (9,821)
Other comprehensive (loss) income, net of tax (49,532)   92,620             (160,741) 287,675 334,613 (102,886) (117,233)
Comprehensive income attributable to Wabtec shareholders $ 38,207   $ 160,019             $ 99,780 $ 500,988 $ 596,874 $ 202,001 $ 281,395