Goodwill and Other Intangible Assets (Other Intangible Assets Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets acquired during the year	$ 2,700,000
Finite-Lived Intangible Assets, Gross	61,900,000	60,000,000
Finite-Lived Intangible Assets, Net	26,300,000	30,600,000
Indefinite-Lived Intangible Assets (Excluding Goodwill)	48,100,000	46,900,000
Capitalized Computer Software, Gross	654,400,000	451,000,000
Capitalized Computer Software, Net	354,400,000	241,300,000
Capitalized Computer Software, Development Stage Costs	161,300,000
Finite-Lived Intangible Assets, Except Capitalized Internal-Use Software [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	8 years
Acquired Finite-lived Intangible Asset, Residual Value	0
Amortization expense	7,500,000	8,100,000	12,200,000
Amortization expense for 2013	6,000,000
Amortization expense for 2014	3,900,000
Amortization expense for 2015	3,200,000
Amortization expense for 2016	2,400,000
Amortization expense for 2017	2,100,000
Amortization expense thereafter	8,700,000
Capitalized Internal Use Software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Asset, Residual Value	0
Amortization expense	100,700,000	70,500,000	48,200,000
Amortization expense for 2013	107,300,000
Amortization expense for 2014	89,400,000
Amortization expense for 2015	44,900,000
Amortization expense for 2016	29,800,000
Amortization expense for 2017	25,600,000
Amortization expense thereafter	$ 57,400,000
Capitalized Internal Use Software, Except Significant System Conversions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	3 years
Maximum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	10 years
Minimum [Member] | Capitalized Internal Use Software, Significant System Conversions [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Weighted-Average Useful Life	8 years