Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Consolidated Balance Sheets
Receivables, allowance (in dollars)	$ 6.0	$ 6.4
Property, plant and equipment, accumulated depreciation (in dollars)	$ 635.7	$ 577.1
Preferred stock, par value (in dollars per share)	$ 1	$ 1
Preferred stock, Authorized shares	5,000,000	5,000,000
Preferred stock, unissued shares	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, Authorized shares	100,000,000	100,000,000
Common stock, issued shares	78,661,248	78,661,248
Common stock, outstanding shares	63,127,299	61,664,813
Treasury, shares	15,249,714	16,467,760