Asset Impairments and Assets Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Asset Impairment [Line Items]
Total assets held for sale	$ 46.9		$ 46.9		$ 3.8
Asset impairments	10.8		42.3	$ 0.0
Accumulated Foreign Currency Adjustment Attributable to Rail International
Asset Impairment [Line Items]
Asset impairments	1.2
Portfolio Management
Asset Impairment [Line Items]
Total assets held for sale	28.4	$ 70.3	28.4		0.0
Asset impairments	0.0	$ 31.5	31.5
Rail North America
Asset Impairment [Line Items]
Total assets held for sale	1.5		1.5		$ 3.8
Asset impairments	0.0		0.0
Rail International
Asset Impairment [Line Items]
Total assets held for sale	17.0		17.0
Asset impairments	$ (10.8)		$ 10.8