Condensed Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Trade receivables, allowances	$ 4.4	$ 7.8
Property, plant and equipment, accumulated depreciation	568.5	528.0
Intangible assets, accumulated amortization	$ 57.2	$ 52.8
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)	238,600,000	237,800,000
Common stock held in employee benefit trust, shares	200,000	200,000
Common stock held in treasury at cost (in shares)	47,500,000	48,300,000