Property, Plant and Equipment (Textuals) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Depreciation	$ 72.8	$ 71.1	$ 68.8
Accumulated depreciation, capitalized leases	1.6	1.1
Capital leases, future minimum payments due, 2013	0.3
Capital leases, future minimum payments due, 2014	0.2
Capital leases, future minimum payments due, 2015	0.2
Accrued construction and development costs	35.3
Capitalized interest	1.9	1.1	0.9
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Capitalized leases	2.4	2.3
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Capitalized leases	$ 1.8	$ 1.9