Business Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue and property, plant and equipment by geographical area
Total revenue	$ 552.1	$ 439.0	$ 454.9	$ 393.4	$ 517.3	$ 447.8	$ 420.7	$ 405.6	$ 1,839.4	$ 1,791.4	$ 1,651.7
Total property, plant and equipment, net	299.5				283.6				299.5	283.6
United States
Revenue and property, plant and equipment by geographical area
Total revenue									359.7	377.2	309.2
Total property, plant and equipment, net	53.8				53.7				53.8	53.7
Germany
Revenue and property, plant and equipment by geographical area
Total revenue									188.9	174.8	195.3
Total property, plant and equipment, net	175.0				155.3				175.0	155.3
Rest of Europe
Revenue and property, plant and equipment by geographical area
Total revenue									583.7	531.3	490.2
Total property, plant and equipment, net	62.7				63.5				62.7	63.5
Asia Pacific
Revenue and property, plant and equipment by geographical area
Total revenue									529.1	525.7	503.6
Total property, plant and equipment, net	5.8				6.0				5.8	6.0
Other
Revenue and property, plant and equipment by geographical area
Total revenue									178.0	182.4	153.4
Total property, plant and equipment, net	$ 2.2				$ 5.1				$ 2.2	$ 5.1