Asset Impairments and Assets Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Asset Impairment [Line Items]
Asset impairments	$ 31.5	$ 31.5	$ 0.0
Total assets held for sale	73.8	73.8		$ 3.8
Portfolio Management
Asset Impairment [Line Items]
Asset impairments	31.5	31.5
Total assets held for sale	70.3	70.3		0.0
Rail North America
Asset Impairment [Line Items]
Asset impairments	0.0	0.0
Total assets held for sale	$ 3.5	$ 3.5		$ 3.8