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EARNINGS PER SHARE - Computation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Numerator |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Wabtec shareholders | $ 135.7 | $ 91.1 | $ 104.1 | $ (4.2) | $ 34.4 | $ 87.7 | $ 84.4 | $ 88.4 | $ 326.7 | $ 294.9 | $ 262.3
Less: dividends declared - common shares and non-vested restricted stock |  |  |  |  |  |  |  |  | (80.3) | (46.3) | (42.2)
Undistributed earnings |  |  |  |  |  |  |  |  | $ 246.4 | $ 248.6 | $ 220.1
Percentage allocated to common shareholders (as a percent) |  |  |  |  |  |  |  |  | 99.70% | 99.70% | 99.70%
Undistributed earnings allocated to common shareholders |  |  |  |  |  |  |  |  | $ 245.7 | $ 247.9 | $ 219.4
Add: dividends declared - common shares |  |  |  |  |  |  |  |  | 80.0 | 46.3 | 42.2
Dividends declared - preferred shares |  |  |  |  |  |  |  |  | (0.4) | 0.0 | 0.0
Numerator for basic earnings per common share |  |  |  |  |  |  |  |  | 325.3 | 294.2 | 261.6
Dividends declared - preferred shares |  |  |  |  |  |  |  |  | 0.4 | 0.0 | 0.0
Numerator for diluted earnings per common share |  |  |  |  |  |  |  |  | $ 325.7 | $ 294.2 | $ 261.6
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per common share - weighted average shares (in shares) |  |  |  |  |  |  |  |  | 170.5 | 96.0 | 95.5
Assumed conversion of preferred shares (in shares) |  |  |  |  |  |  |  |  | 6.4 | 0.0 | 0.0
Assumed conversion of dilutive stock-based compensation plans (in shares) |  |  |  |  |  |  |  |  | 0.4 | 0.5 | 0.6
Denominator for diluted earnings per common shares - adjusted weighted average shares and assumed conversion (in shares) |  |  |  |  |  |  |  |  | 177.3 | 96.5 | 96.1
Net income per common share attributable to Wabtec shareholders |  |  |  |  |  |  |  |  |  |  |
Net income attributable to Wabtec shareholders, basic (in dollars per share) | $ 0.71 | $ 0.48 | $ 0.58 | $ (0.04) | $ 0.36 | $ 0.91 | $ 0.88 | $ 0.92 | $ 1.91 | $ 3.06 | $ 2.74
Net income attributable to Wabtec shareholders (in dollars per share) | $ 0.71 | $ 0.48 | $ 0.54 | $ (0.04) | $ 0.36 | $ 0.91 | $ 0.87 | $ 0.92 | $ 1.84 | $ 3.05 | $ 2.72
Basic weighted average common shares outstanding and non rested restricted stock expected to vest (in shares) |  |  |  |  |  |  |  |  | 171.0 | 96.3 | 95.7

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