Agreements with SK hynix and Micron (Tables)

6 Months Ended

Jun. 30, 2014

SK hynix [Member]

Revenue Recognition, Multiple-deliverable Arrangements [Line Items]

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

The cumulative cash receipts through June 30, 2014 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 June 30,		Estimated to Be Received in										Total Estimated Cash Receipts
	2014		Remainder of 2014		2015		2016		2017		2018
(in millions)
Royalty revenue	$	47.3	$	23.6	$	47.3	$	47.9	$	48.0	$	24.0	$	238.1
Gain from settlement	0.7		0.4		0.7		0.1		—		—		1.9
Total	$	48.0	$	24.0	$	48.0	$	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 June 30, 2014 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 June 30,		Estimated to Be Received in												Total Estimated Cash Receipts
	2014		Remainder of 2014		2015		2016		2017		2018		2019 and thereafter
(in millions)
Royalty revenue	$	24.7	$	19.3	$	38.7	$	39.5	$	40.0	$	40.0	$	74.5	$	276.7
Gain from settlement	0.8		0.7		1.3		0.5		—		—		—		3.3
Total	$	25.5	$	20.0	$	40.0	$	40.0	$	40.0	$	40.0	$	74.5	$	280.0