Business Segment Information - Net Sales to External Customers and Long-lived Assets, by Geographic Region (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	$ 301.3	$ 295.9	$ 580.5	$ 576.2
Total long-lived assets	215.2		215.2		$ 216.9
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	143.0	131.6	272.9	255.2
Total long-lived assets	73.5		73.5		72.8
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total net sales to external customers	158.3	$ 164.3	307.6	$ 321.0
Total long-lived assets	$ 141.7		$ 141.7		$ 144.1