Consolidated Balance Sheets Parenthetical (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts receivable	$ 40.9	$ 43.0
Property, plant, and equipment, accumulated depreciation	$ 3,619.6	$ 3,461.9
Common stock, par value	$ 10
Common stock, shares authorized	65,000,000
Common stock, shares outstanding	33,289,327	33,289,327