Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Trade receivables, allowances	$ 13.2	$ 9.4
Property, plant and equipment, accumulated depreciation	882.8	833.4
Intangible assets, accumulated amortization	$ 130.5	$ 119.2
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	12,000,000.0	12,000,000.0
Preferred stock, shares issued (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	600,000,000	600,000,000.0
Common stock, shares issued (in shares)	286,300,000	286,300,000
Common stock, shares outstanding (in shares)	229,800,000	231,500,000
Common stock, held in employee benefit trust (in shares)	200,000	200,000
Treasury stock (in shares)	56,395,000	54,626,000