Share-Based Compensation and Employee Ownership Plans Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended									3 Months Ended	12 Months Ended								3 Months Ended	12 Months Ended
	Dec. 31, 2012 Equity Plans	Dec. 31, 2011 Equity Plans	Dec. 31, 2010 Equity Plans	Dec. 31, 2012 Equity Plans Employee Stock Option Minimum	Dec. 31, 2012 Equity Plans Employee Stock Option Maximum	Dec. 31, 2012 Equity Plans Restricted Shares and Restricted Stock Units (RSUs) [Member]	Dec. 31, 2011 Equity Plans Restricted Shares and Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Equity Plans Restricted Stock Minimum	Dec. 31, 2012 Equity Plans Restricted Stock Maximum	Dec. 31, 2012 Equity Plans Restricted Stock Units (RSUs) Non-employee Director	Dec. 31, 2012 Equity Plans Restricted Stock Units (RSUs) Non-employee Director	Dec. 31, 2012 Equity Plans Restricted Stock Units (RSUs) Minimum	Dec. 31, 2012 Equity Plans Restricted Stock Units (RSUs) Maximum	Dec. 31, 2012 RCG Grants	Dec. 31, 2011 RCG Grants	Dec. 31, 2010 RCG Grants	Dec. 31, 2012 RCG Grants Restricted Stock	Dec. 31, 2011 RCG Grants Restricted Stock	Dec. 31, 2012 Grants to Non-employee Directors Restricted Stock Units (RSUs)	Dec. 31, 2012 Grants to Non-employee Directors Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized under compensation plan, in shares	17,725,000
Stock compensation award, vesting period				2 years	5 years			2 years	5 years			2 years	5 years				3 years
Stock options, initial term	7 years
Shares available for issuance under compensation plan, in shares	1,100,000									336,895	336,895
Stock-compensation expense recognized in connection with compensation plan	$ 19.9	$ 22.9	$ 14.1											$ 4.9	$ 5.4	$ 6.5
Tax benefit of stock-compensation expense recognized in connection with compensation plan	$ 11.3	$ 11.5	$ 6.0											$ 1.9	$ 2.1	$ 2.6
Shares granted to non-employee board members											257,004								0	257,004
Shares vested in period						4,855,489	3,979,730			0	108,237						1,284,600	1,297,726
Conversion of Stock, Shares Converted																892,782