Segment Information (Net Third Party Sales Classified Based on Geographic Location of Entity) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 11,268.7	$ 11,760.0	$ 10,967.1
Concentration risk, percentage	10.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 3,865.2	4,683.7	5,385.6
India
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	1,164.8	1,082.6	985.8
The Netherlands
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	132.2	117.5	88.3
Other foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 6,106.5	$ 5,876.2	$ 4,507.4