Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data	Jun. 30, 2011	Dec. 31, 2010
Consolidated Balance Sheets
Accounts receivable, allowances (in dollars)	$ 17.6	$ 27.6
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	163,175,928	163,175,928
Common stock, shares outstanding	131,902,200	131,388,472
Treasury stock, shares	31,273,728	31,787,456