Income Taxes (Tables)

6 Months Ended

Jun. 30, 2011

Income Taxes (Tables) [Abstract]

Income Taxes

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2011			2010			2011			2010
Provision for income taxes	$	61.5		$	38.2		$	118.9		$	84.1
Effective tax rate		33.4	%		31.8	%		33.5	%		43.2	%