Financial Instruments and Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value on recurring basis

	Balance at December 31, 2015			Quoted Price in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	$	1,671.6		$	1,235.9		$	435.7		$	—
Forward currency contracts	606.0			—			606.0			—
Purchased currency options	46.7			—			46.7			—
Interest rate swaps	52.5			—			52.5			—
Total assets	$	2,376.8		$	1,235.9		$	1,140.9		$	—
Liabilities:
Contingent value rights	$	(51.9	)	$	(51.9	)	$	—		$	—
Written currency options	(19.1		)	—			(19.1		)	—
Other acquisition related contingent consideration	(1,521.5		)	—			—			(1,521.5		)
Total liabilities	$	(1,592.5	)	$	(51.9	)	$	(19.1	)	$	(1,521.5	)

	Balance at December 31, 2014			Quoted Price in Active Markets for Identical Assets (Level 1)			Significant Other Observable Inputs (Level 2)			Significant Unobservable Inputs (Level 3)
Assets:
Available-for-sale securities	$	3,425.1		$	1,051.3		$	2,373.8		$	—
Forward currency contracts	550.7			—			550.7			—
Purchased currency options	9.8			—			9.8			—
Interest rate swaps	20.0			—			20.0			—
Total assets	$	4,005.6		$	1,051.3		$	2,954.3		$	—
Liabilities:
Contingent value rights	$	(136.3	)	$	(136.3	)	$	—		$	—
Written currency options	(4.6		)	—			(4.6		)	—
Other acquisition related contingent consideration	(1,279.0		)	—			—			(1,279.0		)
Total liabilities	$	(1,419.9	)	$	(136.3	)	$	(4.6	)	$	(1,279.0	)

Roll-forward of fair value of Level 3 instruments (significant unobservable inputs), liabilities

The following table represents a roll-forward of the fair value of Level 3 instruments:

	2015			2014
Liabilities:
Balance at beginning of period	$	(1,279.0	)	$	(228.5	)
Amounts acquired or issued	(166.0		)	(1,060.0		)
Net change in fair value	(76.5		)	(30.5		)
Settlements	—			40.0
Transfers in and/or out of Level 3	—			—
Balance at end of period	$	(1,521.5	)	$	(1,279.0	)