Segment and Geographical Area Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting Information, Operating Income (Loss) [Abstract]
External revenue	$ 192.1	$ 189.8
U.S. [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
External revenue	141.8	140.9
Non-U.S. [Member]
Segment Reporting Information, Operating Income (Loss) [Abstract]
External revenue	$ 50.3	$ 48.9