Goodwill and Other Intangible Assets (Other Intangible Assets Narrative) (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]	Sep. 30, 2011 Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]	Sep. 30, 2012 Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]	Sep. 30, 2011 Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]	Sep. 30, 2012 Capitalized Internal Use Software [Member]	Sep. 30, 2011 Capitalized Internal Use Software [Member]	Sep. 30, 2012 Capitalized Internal Use Software [Member]	Sep. 30, 2011 Capitalized Internal Use Software [Member]	Sep. 30, 2012 Capitalized Internal Use Software, Significant System Conversions [Member]	Sep. 30, 2012 Capitalized Internal Use Software, Except Significant System Conversions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 62.0	$ 60.0
Finite-Lived Intangible Assets, Net	28.1	30.6
Indefinite-Lived Intangible Assets (Excluding Goodwill)	47.6	46.9
Finite-Lived Intangible Assets, Weighted-Average Useful Life					8 years						8 years	3 years
Acquired Finite-lived Intangible Asset, Residual Value	0						0		0
Finite-Lived Intangible Assets, Amortization Expense			2.0	2.0	5.7	6.2	22.8	17.8	64.2	52.4
Amortization expense for remainder 2012			2.1		2.1		25.7		25.7
Amortization expense for 2013			5.8		5.8		102.6		102.6
Amortization expense for 2014			3.7		3.7		78.4		78.4
Amortization expense for 2015			3.2		3.2		41.7		41.7
Amortization expense for 2016			2.4		2.4		26.2		26.2
Amortization expense for 2017			2.2		2.2		21.8		21.8
Amortization expense thereafter			8.7		8.7		43.0		43.0
Capitalized Computer Software, Gross	613.2	451.0
Capitalized Computer Software, Net	339.4	241.3
Capitalized Computer Software, Development Stage Costs							$ 147.5		$ 147.5