Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified		3 Months Ended	1 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Foreign Tax Authority [Member]	Jan. 31, 2014 Domestic Tax Authority [Member]	Mar. 31, 2014 U.K. Tax Expected April 2014 [Member]	Mar. 31, 2014 U.K. Tax Expected April 2015 [Member]
Income Taxes [Line Items]
Income tax rate		35.00%	21.50%	21.00%	20.00%
Unrecognized tax benefits that would have a favorable impact	$ 315.6
Reductions to unrecognized tax benefits, upper bound	$ 230