Acquisitions (Narrative) (Details) (USD $)			6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Jefferies [Member]	Jun. 30, 2013 Jefferies [Member]	Feb. 28, 2013 Jefferies [Member]
Business Acquisition [Line Items]
Aggregate purchase price				$ 4,770,600,000
Conversion of stock, common shares issued				119,363,000
Mandatorily redeemable convertible preferred shares redemption value	125,000,000	125,000,000	125,000,000	125,000,000
Dividend rate on preferred stock			3.25%	3.25%
Goodwill deductible for income tax purposes				111,500,000
Removal of deferred tax liability reversal					$ 34,000,000