Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Millions, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current Assets:
Allowance for doubtful accounts receivable	$ 1.1	$ 1.2
Common Class A [Member]
Stockholders' Equity
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	75,000,000	75,000,000
Common stock, shares issued	13,401,938	13,401,938
Common stock, shares outstanding	13,401,938	13,401,938
Common Class B [Member]
Stockholders' Equity
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	25,000,000	25,000,000
Common stock, shares issued	5,077,746	5,077,746
Common stock, shares outstanding	5,077,746	5,077,746