Fair Value (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

	Fair Value at June 30, 2012
	Total		Level 1		Level 2		Level 3
Assets:
Cash and cash equivalents	$	509.9	$	509.9	$	—	$	—
Short-term investments	28.2		28.2		—		—
Foreign currency hedges	2.7		—		2.7		—
Total Assets	$	540.8	$	538.1	$	2.7	$	—
Liabilities:
Foreign currency hedges	$	4.0	$	—	$	4.0	$	—
Total Liabilities	$	4.0	$	—	$	4.0	$	—