Condensed Consolidated Statements of Comprehensive Income Parentheticals (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Tax provision on change in unrealized gains on available-for-sale securities	$ (22.1)
Tax provision on reclassification adjustment for realized net gains on available-for-sale securities included in net income	60.3
Tax provision on change in unrealized gains on cash flow hedges	(0.6)
Tax benefit on reclassification adjustment for realized gains included in net income	$ (0.1)