Stock-Based Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based, Compensation Cost	$ 3.5	$ 1.4
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	10.3
Deferred Compensation, Share-based Payments [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred Compensation, Shares Outstanding	0.7	0.7
Deferred Compensation, Compensation Expense	0.7	(0.1)
Stock Options SARs and Restricted Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	2
Performance Based Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1
Contingent Compensation Data Center Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum payout of contingent compensation plan	90.0
Payoutofcontingentcompensationplanthresholdvalue	1,000.0
valueofcontingentcompensationminimumvalue	30.0
Valueofcontigentcompensationmaximumvalue	$ 40.0

Maximum payout of contingent compensation plan

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- Definition

Payout of contingent compensation plan threshold value

+ References

No definition available.

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- Definition

Value of contigent compensation maximum value

+ References

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- Definition

value of contingent compensation minimum value

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No definition available.

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- Definition

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 710

-SubTopic 10

-Section 30

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 6, 7

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-Publisher FASB

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- Definition

The number of shares issued pursuant to the terms of the deferred compensation plan as of the balance sheet date.

+ References

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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-Publisher FASB

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-Paragraph A240

-Subparagraph h

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-Publisher FASB

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

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- Definition

Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 50

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-Paragraph 1

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