Financial Instruments - Master Netting Arrangements (Details) - Foreign Exchange Forward and Commodity Contracts - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative assets
Gross amounts	$ 7.2	$ 6.3
Gross amount subject to offset in master netting arrangements that are not offset	(3.2)	(2.5)
Cash collateral paid	0.0	0.0
Net	4.0	3.8
Derivative liabilities
Gross amounts	7.3	8.9
Gross amount subject to offset in master netting arrangements that are not offset	(1.2)	(2.6)
Cash collateral paid	(0.4)	(1.0)
Net	$ 5.7	$ 5.3

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