Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Condensed Consolidated Balance Sheets
Receivables, allowance (in dollars)	$ 4.6	$ 4.7
Property, plant and equipment, accumulated depreciation (in dollars)	$ 583.1	$ 568.7
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	200,000,000	200,000,000
Common stock, shares issued	78,661,248	78,661,248
Common stock, shares outstanding	63,961,112	64,051,600
Treasury, shares	14,472,806	14,383,241