Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Statement of Financial Position [Abstract]
Allowances for accounts receivable	$ 13.0	$ 19.0
Preferred stock, no par value (Class I & Class II Preferred stock)
Preferred stock, shares authorized (Class I & Class II Preferred stock)	10,000,000	10,000,000
Preferred stock, shares issued (Class I & Class II Preferred stock)
Common stock, no par value
Company common stock shares authorized	20,000,000	20,000,000
Common stock, shares issued	98,375,135	98,375,135
Treasury shares	1,045,397	708,327