Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts Receivable	$ 16.2	$ 14.3
Common Class A
Common stock, par value	$ 1	$ 1
Common stock, shares outstanding	6,770,689	6,778,346
Common Class B
Common stock, par value	$ 1	$ 1
Common stock, convertible conversion ratio	1	1
Common stock, shares outstanding	1,582,310	1,595,581