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OTHER COMPREHENSIVE LOSS - Reclassifications Out of Accumulated Other Comprehensive Loss (FY) (Details) - 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
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                            
Other income (expense), net $ 1,201   $ (443)             $ 5,958 $ 5,304 $ 8,868 $ 6,528 $ 3,768
Interest expense, net (23,713)   (20,038)             (75,917) (57,460) (77,884) (50,298) (27,254)
Income tax expense (16,598)   (12,746)             (53,225) (64,776) (89,773) (99,433) (186,740)
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
Reclassification out of Accumulated Other Comprehensive Income | Amortization of initial net obligation and prior service cost                            
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                            
Other income (expense), net (375)   (422)             (1,126) (1,266) (1,496) (1,652)  
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net loss (gain)                            
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                            
Other income (expense), net 1,093   1,240             3,278 3,720 5,037 3,989  
Reclassification out of Accumulated Other Comprehensive Income | Pension And Post Retirement Benefit Plans                            
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                            
Other income (expense), net 718   818             2,152 2,454 3,541 2,337  
Income tax expense (198)   (226)             (594) (678) (979) (695)  
Net income attributable to Wabtec shareholders 520   592             1,558 1,776 2,562 1,642  
Reclassification out of Accumulated Other Comprehensive Income | Derivative Contracts                            
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income On Derivatives [Line Items]                            
Interest expense, net 4,915   497             5,770 1,653 400 1,873  
Income tax expense (1,180)   (131)             (1,456) (447) (140) (557)  
Net income attributable to Wabtec shareholders $ 3,735   $ 366             $ 4,314 $ 1,206 $ 260 $ 1,316