Segment Information Geographical Revenue and Long-Lived Assets (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 304.1				$ 364.5				$ 304.1	$ 364.5	$ 387.0
Net sales	1,289.8	$ 1,119.0	$ 1,105.6	$ 1,064.2	1,249.9	$ 1,122.7	$ 1,133.9	$ 1,102.8	4,578.6	4,609.3	3,316.3
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	77.8				91.7				77.8	91.7	111.2
Net sales									1,047.7	1,049.5	1,093.6
Germany
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	168.2				205.3				168.2	205.3	199.7
Net sales									876.2	843.0	329.4
Other EMEA
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,583.8	1,537.1	853.8
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									556.7	556.3	568.7
Americas [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									1,604.4	1,605.8	1,662.3
Other international
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 58.1				$ 67.5				58.1	67.5	76.1
EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									2,460.0	2,380.1	1,183.2
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales									$ 514.2	$ 623.4	$ 470.8