Amount of paid and unpaid cash dividends declared for classes of stock, for example, but not limited to, common and preferred.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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