Financial Instruments (Foreign Exchange Risk and Its Classification on Balance Sheet) (Details) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Asset position
Asset position	$ 17.7	$ 17.9
Potential effect of rights to offset, asset position	(5.4)	(2.7)
Net derivative, asset position	12.3	15.2
Liability position
Liability position	61.8	14.2
Potential effect of rights to offset, liability position	(5.4)	(2.7)
Net derivative, liability position	56.4	11.5
Undesignated derivative instruments
Asset position
Asset position	17.7	17.9
Liability position
Liability position	31.5	6.5
Designated derivative Instruments
Asset position
Asset position	0.0	0.0
Liability position
Liability position	30.3	7.7
Foreign exchange contracts | Held for sale and other current assets | Undesignated derivative instruments
Asset position
Asset position	17.7	17.9
Foreign exchange contracts | Other current liabilities | Undesignated derivative instruments
Liability position
Liability position	31.5	6.5
Interest rate contracts | Long term borrowings | Designated derivative Instruments
Asset position
Asset position	0.0	0.0
Liability position
Liability position	$ 30.3	$ 7.7