Agreements with SK hynix and Micron (Tables)

3 Months Ended

Mar. 31, 2015

Revenue Recognition, Multiple-deliverable Arrangements [Line Items]

Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]

The cumulative cash receipts through March 31, 2015 and the remaining future cash receipts from the agreements with SK hynix are expected to be recognized as follows assuming no adjustments to the payments under the terms of the agreements:



	Cumulative Received to-date as of March 31,		Estimated to Be Received in								Total Estimated Cash Receipts
	2015		Remainder of 2015		2016		2017		2018		Total Estimated Cash Receipts
(in millions)
Royalty revenue	$	82.7	$	35.5	$	47.9	$	48.0	$	24.0	$	238.1
Gain from settlement	1.3		0.5		0.1		—		—		1.9
Total	$	84.0	$	36.0	$	48.0	$	48.0	$	24.0	$	240.0

Micron [Member]

Revenue Recognition, Multiple-deliverable Arrangements [Line Items]

Revenue Recognition, Multiple-deliverable Arrangements [Table Text Block]

The cumulative cash receipts through March 31, 2015 and the remaining future cash receipts from the agreements with Micron are expected to be recognized as follows assuming no adjustments to the payments under the terms of the agreements:



	Cumulative Received to-date as of March 31,		Estimated to Be Received in												Total Estimated Cash Receipts
	2015		Remainder of 2015		2016		2017		2018		2019		2020		Total Estimated Cash Receipts
(in millions)
Royalty revenue	$	53.7	$	29.0	$	39.5	$	40.0	$	40.0	$	40.0	$	34.5	$	276.7
Gain from settlement	1.8		1.0		0.5		—		—		—		—		3.3
Total	$	55.5	$	30.0	$	40.0	$	40.0	$	40.0	$	40.0	$	34.5	$	280.0