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EARNINGS PER SHARE - Computation of Earnings Per Share (FY) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Numerator                            
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
Less: dividends declared - common shares and non-vested restricted stock (11,586)   (11,518)             (34,682) (30,693) (42,218) (32,430) (26,963)
Undistributed earnings $ 76,153   $ 55,881             $ 225,839 $ 182,620 $ 220,043 $ 272,457 $ 371,665
Percentage allocated to common shareholders (as a percent) 99.70%   99.70%             99.70% 99.40% 99.70% 99.70% 99.70%
Undistributed earnings allocated to common shareholders $ 75,925   $ 55,713             $ 225,161 $ 181,524 $ 219,383 $ 271,640 $ 370,550
Add: dividends declared - common shares 11,552   11,485             34,579 30,508 42,092 32,333 26,875
Numerator for basic and diluted earnings per common share $ 87,477   $ 67,198             $ 259,740 $ 212,032 $ 261,475 $ 303,973 $ 397,425
Denominator                            
Denominator for basic earnings per common share - weighted average shares (in shares) 96,208   95,709             95,935 95,163 95,453 90,359 96,074
Assumed conversion of dilutive stock-based compensation plans (in shares) 429   607             501 645 672 782 932
Denominator for diluted earnings per common shares - adjusted weighted average shares and assumed conversion (in shares) 96,637   96,316             96,436 95,808 96,125 91,141 97,006
Net income per common share attributable to Wabtec shareholders                            
Net income attributable to Wabtec shareholders, basic (in dollars per share) $ 0.91 $ 0.51 $ 0.70 $ 0.75 $ 0.77 $ 0.42 $ 0.92 $ 1.00 $ 1.03 $ 2.71 $ 2.23 $ 2.74 $ 3.37 $ 4.14
Net income attributable to Wabtec shareholders (in dollars per share) $ 0.91 $ 0.51 $ 0.70 $ 0.75 $ 0.77 $ 0.42 $ 0.91 $ 1.00 $ 1.02 $ 2.70 $ 2.22 $ 2.72 $ 3.34 $ 4.10
Basic weighted average common shares outstanding and non rested restricted stock expected to vest (in shares) 96,495   95,983             96,221 95,740 95,740 90,627 96,388