Consolidated Balance Sheets (Parenthetical) (GBP £) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common Stock, Par Value (in USD per share)	£ 0.05	£ 0.05
Common Stock, Shares Authorized	1,000	1,000
Common Stock, Shares, Issued	597.5	562.5
Common Stock, Shares, Outstanding	597.5	562.5
Treasury Stock, Shares	13.4	10.7