Employee Benefit Plans - Other Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 member		Dec. 31, 2011
Executive Plan
Benefit Plans Table Text Block
Total obligation	$ 6.5	[1]	$ 7.5	[1]
Cash surrender of insurance policies	2.5	[2]	2.2	[2]
Directors’ Medical Plan
Benefit Plans Table Text Block
Period of Plan	5 years
Number of members over threshold age	2
Threshold age	70 years
Total obligation	$ 0.4		$ 0.4

[1] Recorded in "Other Long-Term Liabilities" in the Consolidated Balance Sheets.

[2] Recorded in "Other assets, net" in the Consolidated Balance Sheets.