Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value on a recurring basis

The following tables present assets and liabilities measured at fair value on a recurring basis (in millions):

				Fair Value Measurements at Reporting Date Using
	December 31, 2013			Quoted prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Money market funds (1)	$	170.5		$	170.5		$	—		$	—
Equity securities (2)	698.0			698.0			—			—
Investments in pooled funds (2)	12.4			—			12.4			—
Fixed income securities (2)	0.3			—			0.3			—
Deferred compensation liabilities (3)	(44.3		)	(44.3		)	—			—
Derivative instruments (3)	(0.8		)	—			(0.8		)	—
Total	$	836.1		$	824.2		$	11.9		$	—

				Fair Value Measurements at Reporting Date Using
	December 31, 2012			Quoted prices in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Money market funds (1)	$	255.9		$	249.4		$	6.5		$	—
Equity securities (2)	651.7			651.7			—			—
Investments in pooled funds (2)	47.9			—			47.9			—
Fixed income securities (2)	18.4			—			18.4			—
Deferred compensation liabilities (3)	(43.8		)	(43.8		)	—			—
Derivative instruments (3)	(2.3		)	—			(2.3		)	—
Total	$	927.8		$	857.3		$	70.5		$	—