Consolidated Balance Sheets (Parentheticals) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Allowance for accounts receivable	$ 21.4	$ 17.3
Common Class A [Member]
Class A Common stock, par value	$ 1	$ 1
Class A Common stock, shares outstanding	6,778,346	6,737,199
Common Class B [Member]
Class A Common stock, par value	$ 1	$ 1
Class A Common stock, shares outstanding	1,595,581	1,596,093