STOCKHOLDERS' EQUITY - Components of Accumulated Other Comprehensive Income, Net of Tax (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Gains (Losses) on Hedge Instruments
Beginning balance	$ 0.2	$ 0.8	$ 0	$ 0
Other comprehensive income before reclassifications	(0.1)	0.2	0.4	1.6
Reclassified from accumulated other comprehensive income	(0.2)	(0.4)	(0.5)	(1.0)
Net current-period other comprehensive loss	(0.3)	(0.2)	(0.1)	0.6
Ending balance	(0.1)	0.6	(0.1)	0.6
Unrealized Gains (Losses) on Securities
Beginning balance	5.5	7.3	1.7	6.2
Other comprehensive income before reclassifications	(2.5)	(10.2)	1.4	(9.3)
Reclassified from accumulated other comprehensive income	(0.5)	0.1	(0.6)	0.3
Net current-period other comprehensive loss	(3.0)	(10.1)	0.8	(9.0)
Ending balance	2.5	(2.8)	2.5	(2.8)
Foreign Currency Translation Gains (Losses)
Beginning balance	0.7	0	0.4	0.4
Other comprehensive income before reclassifications	0	0.1	0.3	(0.3)
Reclassified from accumulated other comprehensive income	0	0	0	0
Net current-period other comprehensive loss	0	0.1	0.3	(0.3)
Ending balance	0.7	0.1	0.7	0.1
Employee Benefit Plans
Beginning balance	(2.6)	0	0	0
Other comprehensive income before reclassifications	0	0	(2.6)	0
Reclassified from accumulated other comprehensive income	0.1	0	0.1	0
Net current-period other comprehensive loss	0.1	0	(2.5)	0
Ending balance	(2.5)	0	(2.5)	0
Total
Beginning balance	3.8	8.1	2.1	6.6
Other comprehensive income before reclassifications	(2.6)	(9.9)	(0.5)	(8.0)
Reclassified from accumulated other comprehensive income	(0.6)	(0.3)	(1.0)	(0.7)
Net current-period other comprehensive loss	(3.2)	(10.2)	(1.5)	(8.7)
Ending balance	$ 0.6	$ (2.1)	$ 0.6	$ (2.1)