Intangible Assets

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

The Company's intangible assets consist of products acquired via business combinations or asset acquisitions. The following table summarizes the carrying amount of the Company's intangible assets and goodwill, net of accumulated amortization:



	June 30, 2019
	Estimated Life (years)	Cost		Measurement Period Adjustment			Additions		Gross Total		Accumulated Amortization			Net
Intangible assets, net	5-22	$	818.4	$	—		$	10.0	$	828.4	$	(86.0	)	$	742.4
IPR&D	indefinite	50.0		(9.0		)	—		41.0		—			41.0
Goodwill	indefinite	259.7		8.6			—		268.3		—			268.3



	December 31, 2018
	Estimated Life (years)	Cost		Measurement Period Adjustment		Additions		Gross Total		Accumulated Amortization			Net
Intangible assets, net	5-22	$	151.4	$	—	$	667.0	$	818.4	$	(56.8	)	$	761.6
IPR&D	indefinite	50.0		—		—		50.0		—			50.0
Goodwill	indefinite	49.1		—		210.6		259.7		—			259.7

During the six months ended June 30, 2019 and 2018, the Company recorded amortization expense for intangible assets of $29.2 million and $7.8 million, respectively. During the three months ended June 30, 2019 and 2018, the Company recorded amortization expense for intangible assets of $14.7 million and 3.9 million, respectively. As of June 30, 2019, the weighted average amortization period remaining for intangible assets was 14.0 years. IPR&D assets are considered to be indefinite-lived until the completion or abandonment of the associated research and development efforts.