Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]

The Company recognized the following amounts of stock-based compensation expense by award type for the years ended December 31 (in millions):

Award type:	2012		2011		2010
Stock appreciation rights	$	6.4	$	4.4	$	4.6
Common stock equivalents		0.5		0.5		0.5
Restricted stock units		29.5		28.0		27.5
Total (1)	$	36.4	$	32.9	$	32.6

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]

Stock-based compensation expense was recognized by line item in the Consolidated Statements of Operations for the years ended December 31 as follows (in millions):

Amount recorded in:	2012		2011		2010
Costs of services and product development	$	15.3	$	14.8	$	14.8
Selling, general, and administrative		21.1		18.1		17.8
Total	$	36.4	$	32.9	$	32.6

Schedule of Share-based Compensation, Stock Appreciation Rights Award Activity [Table Text Block]

The fair value of the SARs granted was estimated on the date of grant using the Black-Scholes-Merton valuation model with the following weighted-average assumptions for the years ended December 31:

	2012			2011			2010
Expected dividend yield (1)		0	%		0	%		0	%
Expected stock price volatility (2)		40	%		38	%		40	%
Risk-free interest rate (3)		0.8	%		2.2	%		2.4	%
Expected life in years (4)		4.61			4.75			4.75

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table summarizes the changes in stock options outstanding during the year ended December 31, 2012:

	Options in millions			Per Share Weighted- Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value (in millions)
Vested and outstanding at December 31, 2011		1.2		$	10.93		1.47 years	$	27.7
Expired		—			—		na		na
Exercised		(0.9	)		10.59		na		25.9
Vested and outstanding at December 31, 2012		0.3		$	11.73		1.28 years	$	11.7

Stock Appreciation Rights (SARs) [Member]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

The following table summarizes changes in SARs outstanding for the year ended December 31, 2012:

	SARs in millions			Per Share Weighted- Average Exercise Price		Per Share Weighted- Average Grant Date Fair Value		Weighted- Average Remaining Contractual Term
Outstanding at December 31, 2011		2.5		$	20.39	$	7.66		4.00 years
Granted		0.4			37.81		12.99		6.11 years
Forfeited		—			—		—		—
Exercised		(0.9	)		18.35		6.82		na
Outstanding at December 31, 2012 (1), (2)		2.0		$	24.59	$	9.04		4.10 years
Vested and exercisable at December 31, 2012 (2)		0.8		$	18.74	$	7.14		3.12 years

Restricted Stock Units (RSUs) [Member]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

The following table summarizes the changes in RSUs outstanding during the year ended December 31, 2012:

	Restricted Stock Units (RSUs) (in millions)			Per Share Weighted Average Grant Date Fair Value
Outstanding at December 31, 2011		3.1		$	21.53
Granted (1)		0.7			37.98
Vested and released		(1.3	)		19.53
Forfeited		—			—
Outstanding at December 31, 2012 (2), (3)		2.5		$	27.95

Common Stock Equivalents [Member]

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]

The following table summarizes the changes in CSEs outstanding for the year ended December 31, 2012:

	Common Stock Equivalents (CSEs)			Per Share Weighted Average Grant Date Fair Value
Outstanding at December 31, 2011		97,268		$	15.93
Granted		11,373			45.30
Converted to common shares		(8,096	)		45.27
Outstanding at December 31, 2012		100,545		$	16.89