Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on a recurring basis

The following tables present information about our financial instruments measured at fair value on a recurring basis as of December 31, 2012 and December 31, 2011, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.

	December 31, 2012												Balance Sheet Classification
	Level 1			Level 2			Level 3			Total
Assets
Cash equivalents	$	1,806.6		$	0.0		$	0.0		$	1,806.6		Cash and cash equivalents
Short-term marketable securities	16.0			0.0			0.0			16.0			Marketable securities
Long-term investments	1.5			0.0			0.0			1.5			Other assets
Total	$	1,824.1		$	0.0		$	0.0		$	1,824.1
As a percentage of total assets	13.5		%	0.0		%	0.0		%	13.5		%
Liabilities
Mandatorily redeemable noncontrolling interests 1	$	0.0		$	0.0		$	25.3		$	25.3
	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		%	12.5		%
Liabilities
Mandatorily redeemable noncontrolling interests 1	$	0.0		$	0.0		$	58.9		$	58.9

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 financial instruments measured at fair value on a recurring basis and for which we utilize Level 3 inputs to determine fair value.

	Years ended December 31,
Liabilities	2012			2011
Mandatorily redeemable noncontrolling interests -     Balance at beginning of period	$	58.9		$	52.0
Level 3 additions	0.0			28.1
Level 3 reductions	(34.9		)	(28.0		)
Realized losses included in net income	(1.4		)	(6.7		)
Foreign currency translation	(0.1		)	0.1
Mandatorily redeemable noncontrolling interests -     Balance at end of period	$	25.3		$	58.9

Assets and liabilities measured at fair value on a nonrecurring

The following table presents information about our financial instruments that are not measured at fair value on a recurring basis as of December 31, 2012, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.

	December 31, 2012
	Level 1		Level 2		Level 3		Total
Total long-term debt	$	0.0	$	2,292.4	$	90.8	$	2,383.2