Commitments and Contingencies (Textuals) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Leased Assets [Line Items]
Net rental expense	$ 12.0	$ 11.4	$ 10.2
Sublease income	0.4	0.8	0.7
Outstanding unconditional contractual commitments for the purchase of raw materials, utilities and equipment	24.5
Outstanding uncondintional contractual commitments due to be paid in 2013	16.7
Minimum [Member]
Operating Leased Assets [Line Items]
Lease term	1 month
Maximum [Member]
Operating Leased Assets [Line Items]
Lease term	35 years
Insurance Claims [Member]
Operating Leased Assets [Line Items]
Accrual for insurance obligations	9.5
Amount reimbursable by the insurance company	5.6
Brazil [Member] | Foreign Tax Authority [Member]
Operating Leased Assets [Line Items]
Accrul for tax obligations	4.1
Revolving Credit Facility Due 2017 [Member] | Letter of Credit [Member]
Operating Leased Assets [Line Items]
Letters of credit supporting the reimbursement of workers' compensation and other claims	$ 3.6