Stock-Based Compensation (Details 1) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock- Based Compensation (Textual) [Abstract]
Shares of common stock provides for awarding	6,000,000
Number of shares available for issuance	2,062,102
Maximum period of incentive stock option granted	10 years
Options exercisable period range	5 years
Employee earnings percentage based on target performance	200.00%
Total stock-based compensation (approximately)	$ 23.5	$ 15.7	$ 13.5
Income tax benefit related to stock base compensation	10.0	4.0	2.3
Capitalized stock based compensation costs	0	0	0
Unrecognized compensation expense related to stock options	0.4
Intrinsic value of options outstanding	9.0
Intrinsic value of options exercised	3.6	0.9	0.3
Long term incentive plans vesting period, minimum	1 year
Long term incentive plans vesting period, maximum	15 years
Unrecognized compensation expense related to restricted share awards	67.2
Restricted Stock Units (RSUs) [Member]
Share based compensation arrangement by share based payment award equity instruments other than options nonvested
Number of restricted share award, granted	925,140
Number of restricted share award, vested	(745,147)
Number of restricted share award, forfeited	(93,460)
Number of restricted share award, ending balance	3,062,661	2,976,128
Number of restricted share award, beginning balance	2,976,128
Weighted average fair value per award, granted	$ 34.21
Weighted average fair value per award, vested	$ 25.62
Weighted average fair value per award, forfeited	$ 26.17
Weighted average fair value of restricted share awards, ending balance	$ 27.39	$ 24.79
Weighted average fair value of restricted share awards, beginning balance	$ 24.79
Weighted average recognition period	4.2
Fair value of vested shares	$ 23.3	$ 11.7	$ 7.4
Restricted Stock [Member]
Share based compensation arrangement by share based payment award equity instruments other than options nonvested
Weighted average fair value of restricted share awards granted	$ 34.21	$ 25.18	$ 15.68
Stock Option [Member]
Share based compensation arrangement by share based payment award equity instruments other than options nonvested
Weighted average recognition period	0.4

Employee earnings percentage based on target Performance.

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Long term incentive plans vesting period, maximum.

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Long term incentive plans vesting period, minimum.

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Maximum period during which options become exercisable in various percentages.

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Maximum period of incentive stock option granted.

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Number of shares available for issuance.

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Unrecognized compensation expense related to restricted share awards.

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Unrecognized compensation expense related to stock options.

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Represents the compensation cost capitalized during the period arising from equity-based compensation arrangements (for example, shares of stock, units, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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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.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 28

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Paragraph A240

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Paragraph A240

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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