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Goodwill and Intangible Assets - Change in the Carrying Amount of Goodwill by Segment (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Goodwill [Roll Forward]
Beginning balance	$ 8,485.2
Additions	214.1
Foreign currency impact	(94.6)
Ending balance	8,604.7
Freight Segment
Goodwill [Roll Forward]
Beginning balance	6,872.2
Additions	214.1
Foreign currency impact	(9.3)
Ending balance	7,077.0
Transit Segment
Goodwill [Roll Forward]
Beginning balance	1,613.0
Additions	0.0
Foreign currency impact	(85.3)
Ending balance	$ 1,527.7

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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X

- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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