Business Segment Information - Information by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue and property, plant and equipment by geographical area
Total revenue	$ 470.3	$ 393.9	$ 371.7	$ 375.4	$ 478.2	$ 396.1	$ 396.0	$ 353.5	$ 1,611.3	$ 1,623.8	$ 1,808.9
Total property, plant and equipment, net	239.1				231.1				239.1	231.1
United States
Revenue and property, plant and equipment by geographical area
Total revenue									428.2	380.4	387.6
Total property, plant and equipment, net	46.4				43.2				46.4	43.2
Germany
Revenue and property, plant and equipment by geographical area
Total revenue									189.5	198.9	215.1
Total property, plant and equipment, net	122.5				125.9				122.5	125.9
Rest of Europe
Revenue and property, plant and equipment by geographical area
Total revenue									393.4	479.6	522.9
Total property, plant and equipment, net	63.3				54.7				63.3	54.7
Asia Pacific
Revenue and property, plant and equipment by geographical area
Total revenue									458.1	414.9	495.5
Total property, plant and equipment, net	4.4				4.2				4.4	4.2
Other
Revenue and property, plant and equipment by geographical area
Total revenue									142.1	150.0	$ 187.8
Total property, plant and equipment, net	$ 2.5				$ 3.1				$ 2.5	$ 3.1