Guarantor Subsidiaries Financial Information - Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Preferred stock, outstanding (in shares)	0	0
Cash and cash equivalents	$ 615.9	$ 604.2	$ 512.9	$ 2,342.4
Receivables, net	1,672.0	1,663.9
Inventories	1,785.7	1,773.1
Current assets - other	167.5	150.9
Total current assets	4,241.1	4,192.1
Property, plant and equipment, net	1,623.0	1,655.8
Goodwill	8,273.7	8,360.6
Investment in subsidiaries	0.0	0.0
Other intangibles, net	4,010.0	4,104.0
Other long-term assets	625.3	631.7
Total Assets	18,773.1	18,944.2
Current liabilities	2,981.6	3,258.0
Inter-company	0.0	0.0
Long-term debt	4,655.1	4,333.6
Long-term liabilities - other	1,338.7	1,359.0
Total Liabilities	8,975.4	8,950.6
Shareholders' equity	9,761.8	9,956.5
Noncontrolling interest	35.9	37.1
Total Equity	9,797.7	9,993.6	9,780.4	2,869.1
Total Liabilities and Equity	18,773.1	18,944.2
Elimination
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	0.0	0.0	0.0	0.0
Receivables, net	0.0	0.0
Inventories	0.0	0.0
Current assets - other	0.0	0.0
Total current assets	0.0	0.0
Property, plant and equipment, net	0.0	0.0
Goodwill	0.0	0.0
Investment in subsidiaries	(22,337.0)	(22,150.1)
Other intangibles, net	0.0	0.0
Other long-term assets	0.0	0.0
Total Assets	(22,337.0)	(22,150.1)
Current liabilities	0.0	0.0
Inter-company	0.0	0.0
Long-term debt	0.0	0.0
Long-term liabilities - other	0.0	0.0
Total Liabilities	0.0	0.0
Shareholders' equity	(22,337.0)	(22,150.1)
Noncontrolling interest	0.0	0.0
Total Equity	(22,337.0)	(22,150.1)
Total Liabilities and Equity	(22,337.0)	(22,150.1)
Parent | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	14.6	24.0	5.3	1,782.7
Receivables, net	130.3	103.5
Inventories	137.7	135.3
Current assets - other	0.3	(0.8)
Total current assets	282.9	262.0
Property, plant and equipment, net	78.8	73.2
Goodwill	527.4	564.1
Investment in subsidiaries	15,638.8	15,566.2
Other intangibles, net	36.5	35.8
Other long-term assets	103.6	105.6
Total Assets	16,668.0	16,606.9
Current liabilities	503.0	586.0
Inter-company	1,382.0	1,357.6
Long-term debt	4,643.4	4,321.8
Long-term liabilities - other	378.0	385.0
Total Liabilities	6,906.4	6,650.4
Shareholders' equity	9,746.6	9,941.5
Noncontrolling interest	15.0	15.0
Total Equity	9,761.6	9,956.5
Total Liabilities and Equity	16,668.0	16,606.9
Guarantors | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	5.8	14.7	0.0	0.0
Receivables, net	316.5	298.2
Inventories	759.5	763.1
Current assets - other	29.4	22.0
Total current assets	1,111.2	1,098.0
Property, plant and equipment, net	68.0	65.0
Goodwill	284.2	283.2
Investment in subsidiaries	6,698.2	6,583.9
Other intangibles, net	760.2	731.2
Other long-term assets	115.9	116.2
Total Assets	9,037.7	8,877.5
Current liabilities	1,042.2	1,109.6
Inter-company	(2,763.0)	(2,546.3)
Long-term debt	0.0	0.0
Long-term liabilities - other	128.4	154.1
Total Liabilities	(1,592.4)	(1,282.6)
Shareholders' equity	10,630.1	10,160.1
Noncontrolling interest	0.0	0.0
Total Equity	10,630.1	10,160.1
Total Liabilities and Equity	9,037.7	8,877.5
Non-Guarantors | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Cash and cash equivalents	595.5	565.5	$ 507.6	$ 559.7
Receivables, net	1,225.2	1,262.2
Inventories	888.5	874.7
Current assets - other	137.8	129.7
Total current assets	2,847.0	2,832.1
Property, plant and equipment, net	1,476.2	1,517.6
Goodwill	7,462.1	7,513.3
Investment in subsidiaries	0.0	0.0
Other intangibles, net	3,213.3	3,337.0
Other long-term assets	405.8	409.9
Total Assets	15,404.4	15,609.9
Current liabilities	1,436.4	1,562.4
Inter-company	1,381.0	1,188.7
Long-term debt	11.7	11.8
Long-term liabilities - other	832.3	819.9
Total Liabilities	3,661.4	3,582.8
Shareholders' equity	11,722.1	12,005.0
Noncontrolling interest	20.9	22.1
Total Equity	11,743.0	12,027.1
Total Liabilities and Equity	$ 15,404.4	$ 15,609.9
Series A Preferred Stock | Wabtec
Condensed Financial Statements, Captions [Line Items]
Preferred stock, outstanding (in shares)	15,000