Condensed Consolidated Statements of Comprehensive Income (Unaudited) (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	$ 221.1	$ 97.9	$ 331.7	$ 188.9
Available-for-sale securities:
Change in unrealized gains on available-for-sale securities, net of tax provision of ($6.1) and ($28.2) for the three and six months ended June 30, 2014, respectively, and $(3.9) and $(4.0) for the corresponding periods of fiscal 2013, respectively	10.3	5.8	48.4	5.6
Reclassification adjustment for realized net gains on available-for-sale securities included in net income, net of tax provision of $0.1 and $60.4 for the three and six months ended June 30, 2014, respectively, and $0.1 and $0.2 for the corresponding periods of fiscal 2013, respectively	(0.3)	(0.1)	(103.8)	(0.5)
Net change in unrealized gains on available- for-sale securities, net of taxes	10.0	5.7	(55.4)	5.1
Cash flow hedges:
Change in unrealized gains (losses) on cash flow hedges, net of tax (provision) benefit of ($0.7) and ($1.3) for the three and six months ended June 30, 2014, respectively, and $1.6 and $1.6 for the corresponding periods of fiscal 2013, respectively	1.1	(0.1)	3.2	(2.2)
Reclassification adjustment for realized net gains on cash flow hedges included in net income, net of tax provision of $0.4 and $0.3 for the three and six months ended June 30, 2014, respectively, and $0.1 and $0.2 for the corresponding periods of fiscal 2013, respectively	(2.1)	(0.4)	(3.2)	(1.8)
Net change in unrealized gains on cash flow hedges, net of taxes	(1.0)	(0.5)	0	(4.0)
Change in foreign currency translation adjustments	2.2	(3.7)	3.9	(9.5)
Other comprehensive income (loss), net of tax	11.2	1.5	(51.5)	(8.4)
Comprehensive income	$ 232.3	$ 99.4	$ 280.2	$ 180.5