Fair Value Measurement of Assets and Liabilities

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurement of Assets and Liabilities

9. Fair Value Measurement of Assets and Liabilities

The following assets and liabilities are recorded at fair value on a recurring basis (in millions):

	As of March 31, 2015
	Recorded Balance		Fair Value Measurements at Reporting Date Using:
Description			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Available-for-sale securities
Corporate debt securities	$	494.4	$	—	$	494.4	$	—
U.S. government and agency debt securities		133.7		—		133.7		—
Commercial paper		34.4		—		34.4		—
Certificates of deposit		37.9		—		37.9		—
Total available-for-sale securities		700.4		—		700.4		—
Derivatives, current and long-term
Foreign currency forward contracts and options		179.7		—		179.7		—
Interest rate swaps		31.2		—		31.2		—
	$	911.3	$	—	$	911.3	$	—
Liabilities
Derivatives, current and long-term
Foreign currency forward contracts and options	$	0.2	$	—	$	0.2	$	—

	As of December 31, 2014
	Recorded Balance		Fair Value Measurements at Reporting Date Using:
Description			Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Available-for-sale securities
Corporate debt securities	$	516.5	$	—	$	516.5	$	—
U.S. government and agency debt securities		194.3		—		194.3		—
Commercial paper		57.8		—		57.8		—
Certificates of deposit		100.3		—		100.3		—
Total available-for-sale securities		868.9		—		868.9		—
Derivatives, current and long-term
Foreign currency forward contracts and options		125.5		—		125.5		—
Interest rate swaps		24.0		—		24.0		—
	$	1,018.4	$	—	$	1,018.4	$	—
Liabilities
Derivatives, current and long-term
Foreign currency forward contracts and options	$	1.7	$	—	$	1.7	$	—
Forward starting interest rate swaps		59.3		—		59.3		—
	$	61.0	$	—	$	61.0	$	—

We value our available-for-sale securities using a market approach based on broker prices for identical assets in over-the-counter markets and we perform ongoing assessments of counterparty credit risk.

We value our foreign currency forward contracts and foreign currency options using a market approach based on foreign currency exchange rates obtained from active markets and we perform ongoing assessments of counterparty credit risk.

We value our interest rate swaps using a market approach based on publicly available market yield curves and the terms of our swaps and we perform ongoing assessments of counterparty credit risk.