Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2011

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on recurring basis

The following tables present information about our assets and liabilities measured at fair value on a recurring basis as of December 31, 2011, and December 31, 2010, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.

	December 31, 2011												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total
Assets
Cash equivalents	$	1,596.5		$	0.0		$	0.0		$	1,596.5		Cash and cash equivalents
Short-term marketable securities	12.9			0.0			0.0			12.9			Marketable securities
Long-term investments	1.3			9.0			0.0			10.3			Other assets
Total	$	1,610.7		$	9.0		$	0.0		$	1,619.7
As a percentage of total assets	12.5		%	0.1		%	0.0		%	12.6		%
Liabilities
Mandatorily redeemable noncontrolling interests 1	$	0.0		$	0.0		$	58.9		$	58.9
	December 31, 2010												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total
Assets
Cash equivalents	$	1,744.4		$	0.0		$	0.0		$	1,744.4		Cash and cash equivalents
Short-term marketable securities	13.7			0.0			0.0			13.7			Marketable securities
Long-term investments	1.3			13.8			0.0			15.1			Other assets
Total	$	1,759.4		$	13.8		$	0.0		$	1,773.2
As a percentage of total assets	13.5		%	0.1		%	0.0		%	13.6		%
Liabilities
Mandatorily redeemable noncontrolling interests 1	$	0.0		$	0.0		$	52.0		$	52.0

¹  Relates to unconditional obligations to purchase additional noncontrolling equity shares of consolidated subsidiaries. Fair value measurement of the obligation was based upon the amount payable as if the forward contracts were settled. The amount redeemable within the next twelve months is classified in accrued liabilities; any interests redeemable thereafter are classified in other non-current liabilities.

Assets and liabilities measured at fair value on recurring basis - level 3 reconciliation

The following tables present additional information about assets and liabilities measured at fair value on a recurring basis and for which we utilize Level 3 inputs to determine fair value.

	Years ended December 31,
	2011			2010
	Liabilities			Assets			Liabilities
	Mandatorily redeemable noncontrolling interests			Foreign currency derivatives			Mandatorily redeemable noncontrolling interests
Balance at beginning of period	$	52.0		$	0.6		$	47.8
Level 3 additions	28.1			0.0			2.7
Level 3 reductions	(28.0		)	0.0			(2.9		)
Realized losses included in net income	(6.7		)	(0.6		)	(4.4		)
Foreign currency translation	0.1			0.0			0.0
Balance at end of period	$	58.9		$	0.0		$	52.0

Gross unrealized and realized gains and losses on investments

Gross unrealized and realized gains and losses for our long-term investments and short-term marketable securities are listed below.

	Years ended December 31,
	2011		2010		2009
Reported in comprehensive income
Unrealized gains	$	0.3	$	0.5	$	0.9
Unrealized losses	0.4		0.0		0.5
Reported in other income, net
Realized gains	$	0.0	$	0.2	$	1.0
Realized losses	0.3		0.0		0.6