Financial Instruments - Master Netting Arrangements (Details) - Foreign Exchange Forward and Commodity Contracts - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Asset
Gross amounts	$ 14.0	$ 5.5
Gross amount subject to offset in master netting arrangements that are not offset	(3.7)	(1.0)
Cash collateral paid	0.0	0.0
Net	10.3	4.5
Liability
Gross amounts	8.2	6.2
Gross amount subject to offset in master netting arrangements that are not offset	(3.0)	(2.0)
Cash collateral paid	0.0	(0.4)
Net	$ 5.2	$ 3.8

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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