Commitments and Contingencies - Asbestos Claimant and Settlement (Details) (Asbestos [Member], USD $)	12 Months Ended
	Dec. 31, 2012 claimants	Dec. 31, 2011 claimants	Dec. 31, 2010 claimants
Asbestos [Member]
Loss Contingencies [Line Items]
Number of pending claims at the beginning of period	8,048	8,200	7,816
Number of pending claims filed during period	367	476	892
Number of pending claims dismissed during period	519	607	456
Number of pending claims settled during period	16	21	52
Average settlement amount per claim during period	$ 14,513	$ 14,300	$ 7,029
Total defense costs during period	$ 2,650,000	$ 2,510,000	$ 2,870,000