Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment
Property, plant and equipment, at cost	$ 526.7	$ 539.2
Accumulated depreciation	(323.4)	(319.3)
Property, plant and equipment, net	203.3	219.9	221.7
Land
Property, plant and equipment
Property, plant and equipment, at cost	13.9	15.2
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, at cost	160.1	166.3
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	343.7	353.2
Construction in progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 9.0	$ 4.5