Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Net income	$ 91.0		$ 16.3
Available-for-sale securities:
Change in unrealized (losses) gains on available-for-sale securities	(0.2)		3.1
Reclassification adjustment for realized net gains on available-for-sale securities included in net income	(0.4)		(0.3)
Net change in unrealized (losses) gains on available-for-sale securities	(0.6)		2.8
Cash flow hedges:
Change in unrealized (losses) gains on cash flow hedges	(2.1)		6.0
Reclassification adjustment for realized (gains) losses on cash flow hedges included in net income	(1.4)		3.5
Net change in unrealized (losses) gains on cash flow hedges	(3.5)		9.5
Change in foreign currency translation adjustments	(5.8)		4.6
Other comprehensive (loss) income, net of tax	(9.9)	[1]	16.9
Comprehensive income	$ 81.1		$ 33.2

[1] Taxes related to each component of other comprehensive loss were not material for the three months ended March 31, 2013 and March 31, 2012.