Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions		3 Months Ended	6 Months Ended	9 Months Ended
		Mar. 31, 2020	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019
Guarantor Obligations
Guarantor obligations, maximum exposure, undiscounted		$ 5,899.2			$ 5,861.5
Litigation Settlement, Amount Awarded to Other Party			$ 301.3
Litigation Settlement, Expense				$ 5.1
Estimated Litigation Liability		$ 70.0
Indirect guarantee of indebtedness
Guarantor Obligations
Guarantor obligations, term of obligation		P5Y
Financial guarantees
Guarantor Obligations
Guarantor obligations, maximum exposure, undiscounted	[1]	$ 930.0			945.5
Performance guarantees
Guarantor Obligations
Guarantor obligations, maximum exposure, undiscounted	[2]	$ 4,969.2			$ 4,916.0

[1] Financial guarantees represent contracts that contingently require a guarantor to make payments to a guaranteed party based on changes in an underlying agreement that is related to an asset, a liability or an equity security of the guaranteed party. These tend to be drawn down only if there is a failure to fulfill our financial obligations.

[2] Performance guarantees represent contracts that contingently require a guarantor to make payments to a guaranteed party based on another entity's failure to perform under a nonfinancial obligating agreement. Events that trigger payment are performance-related, such as failure to ship a product or provide a service.