Agreement with SK hynix and Micron (Tables)

3 Months Ended

Mar. 31, 2014

Patent License Agreement [Abstract]

Schedule of cash receipts

The cumulative cash receipts through March 31, 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 March 31,		Estimated to Be Received in										Total Estimated Cash Receipts
	2014		Remainder of 2014		2015		2016		2017		2018
(in millions)
Royalty revenue	$	35.4	$	35.5	$	47.3	$	47.9	$	48.0	$	24.0	$	238.1
Gain from settlement	0.6		0.5		0.7		0.1		—		—		1.9
Total	$	36.0	$	36.0	$	48.0	$	48.0	$	48.0	$	24.0	$	240.0

The cumulative cash receipts through March 31, 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 March 31,		Estimated to Be Received in												Total Estimated Cash Receipts
	2014		Remainder of 2014		2015		2016		2017		2018		2019 and thereafter
(in millions)
Royalty revenue	$	15.0	$	29.0	$	38.7	$	39.5	$	40.0	$	40.0	$	74.5	$	276.7
Gain from settlement	0.5		1.0		1.3		0.5		—		—		—		3.3
Total	$	15.5	$	30.0	$	40.0	$	40.0	$	40.0	$	40.0	$	74.5	$	280.0