Stockholders' Equity (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Summary of the changes in Stockholders' Equity
Stockholders' Equity, Beginning Balance			$ 3,281.7
Common stock issued under employee plans			42.6
Increase in additional paid-in capital for share-based compensation plans			16.2
Net income attributable to common shareholders	52.7	70.6	98.0	140.4
Other comprehensive loss	18.0	(46.5)	35.4	(61.9)
Tax benefit from employee stock plans			9.9
Repurchase of common stock			(11.1)
Stockholders' Equity, Ending Balance	$ 3,472.7		$ 3,472.7