Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2011

Earnings Per Share [Abstract]

Number of Shares Used to Compute Basic and Diluted Earnings Per Share

The denominator used to compute basic and diluted earnings per share is as follows (in millions):

	Quarter  Ended June 30,				Six Months Ended June 30,
	2011		2010		2011		2010
Denominator for basic EPS – weighted average shares		41.7		41.2		41.6		41.1
Effect of dilutive securities:
Employee/director stock options and restricted stock units		0.5		0.2		0.4		0.3
Denominator for diluted EPS – weighted average shares		42.2		41.4		42.0		41.4