Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, plant and equipment
Property, plant and equipment, at cost	$ 539.2	$ 510.2
Accumulated depreciation	(319.3)	(288.5)
Property, plant and equipment, net	219.9	221.7	220.4
Land
Property, plant and equipment
Property, plant and equipment, at cost	15.2	15.8
Buildings and improvements
Property, plant and equipment
Property, plant and equipment, at cost	166.3	156.4
Machinery and equipment
Property, plant and equipment
Property, plant and equipment, at cost	353.2	322.5
Construction in progress
Property, plant and equipment
Property, plant and equipment, at cost	$ 4.5	$ 15.5