Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Trade receivables, allowances	$ 9.4	$ 7.4
Property, plant and equipment, accumulated depreciation	835.9	770.2
Intangible assets, accumulated amortization	$ 114.4	$ 97.3
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	12,000,000	12,000,000
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
Common stock, shares issued (in shares)	286,300,000	286,300,000
Common stock, shares outstanding (in shares)	233,900,000	235,800,000
Common stock, held in employee benefit trust (in shares)	200,000	200,000
Treasury stock (in shares)	52,159,000	50,318,000