Commitments and Contingent Liabilities (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Guarantor Obligations
Guarantor obligations, maximum exposure, undiscounted	$ 4,573.4
Indirect Guarantee of Indebtedness
Guarantor Obligations
Financial instruments expiration period	P5Y
Financial guarantees
Guarantor Obligations
Guarantor obligations, maximum exposure, undiscounted	$ 839.6	[1]
Performance guarantees
Guarantor Obligations
Guarantor obligations, maximum exposure, undiscounted	$ 3,733.8	[2]

[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.