Condensed Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net income	$ 137.8	$ 78.5	$ 238.2	$ 171.7
Other comprehensive income (loss), net of tax and reclassifications to earnings:
Unrealized holding gains (losses) on available-for-sale securities	(8.5)	25.1	(49.9)	63.0
Unrealized gains on cash flow hedges	0.2	0.3	0.4	0.7
Foreign currency translation adjustments	1.7	(1.0)	2.1	(5.4)
Other comprehensive income (loss)	(6.6)	24.4	(47.4)	58.3
Comprehensive income	$ 131.2	$ 102.9	$ 190.8	$ 230.0