Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Measurements [Abstract]

Financial Assets And Liabilities Measured At Fair Value

Description	Fair Value		Level 1		Level 2		Level 3
December 31, 2010
Assets:
Money market fund investments	$	12.6	$	12.6	$	—	$	—
Total	$	12.6	$	12.6	$	—	$	—