STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Gains (Losses) on Hedge Instruments
Beginning balance	$ 0	$ 0
Other comprehensive income before reclassifications	0.5	1.4
Reclassified from accumulated other comprehensive income	(0.3)	(0.6)
Net current-period other comprehensive income	0.2	0.8
Ending balance	0.2	0.8
Unrealized Gains (Losses) on Securities
Beginning balance	1.7	6.2
Other comprehensive income before reclassifications	3.9	0.9
Reclassified from accumulated other comprehensive income	(0.1)	0.2
Net current-period other comprehensive income	3.8	1.1
Ending balance	5.5	7.3
Foreign Currency Translation Gains (Losses)
Beginning balance	0.4	0.4
Other comprehensive income before reclassifications	0.3	(0.4)
Reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	0.3	(0.4)
Ending balance	0.7	0
Employee Benefit Plans
Beginning balance	0	0
Other comprehensive income before reclassifications	(2.6)	0
Reclassified from accumulated other comprehensive income	0	0
Net current-period other comprehensive income	(2.6)	0
Ending balance	(2.6)	0
Total
Beginning balance	2.1	6.6
Other comprehensive income before reclassifications	2.1	1.9
Reclassified from accumulated other comprehensive income	(0.4)	(0.4)
Net current-period other comprehensive income	1.7	1.5
Ending balance	$ 3.8	$ 8.1