Segment and Geographical Area Information, Income Taxes Paid by Geographical Area (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information
Income Taxes Paid	$ 0.3	$ 0.5	$ 0.5	$ 0.8
Domestic
Segment Reporting Information
Income Taxes Paid	0.3	0.2	0.4	0.3
Foreign
Segment Reporting Information
Income Taxes Paid	$ 0.0	$ 0.3	$ 0.1	$ 0.5