Shareholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2011 Y	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	4,250,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	1,220,847
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	30,710
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures	0
Employee Stock Ownership Plan (ESOP), Shares in ESOP	3,069,988
Employee Stock Purchase Plan, Maximum Payroll Deduction	15.00%
Employee Stock Purchase Plan, Percent of Total Share Value	95.00%
Proceeds from ESPP	$ 0.3
Shares from ESPP	13,027
Stock Repurchase Program, Authorized Amount	200.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	64.1
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, beginning balance (in shares)	855,000	991,000	830,000
Outstanding, beginning balance, Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 38.23	$ 40.31	$ 37.83
Granted (in shares)	0	285,000	504,000
Granted, Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 0.00	$ 28.30	$ 40.42
Vested (in shares)	(368,000)	(350,000)	(277,000)
Vested, Weighted Average Grant Date Fair Value Per Share (in dollars per share)	$ 39.25	$ 36.16	$ 33.22
Forfeited (in shares)	(15,000)	(71,000)	(66,000)
Forfeited, Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 39.62	$ 37.62	$ 41.29
Outstanding, ending balance (in shares)	472,000	855,000	991,000
Outstanding, ending balance, Weighted Average Grant Date Fair Value per Share (in dollars per share)	$ 37.39	$ 38.23	$ 40.31
Allocated Share-based Compensation Expense	9.1	13.0	10.8
Allocated Share-based Compensation Expense, Net of Tax	6.7	7.7	7.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	14.4	12.7	9.2
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	4.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1.0
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Outstanding, ending balance (in shares)	410,531
Allocated Share-based Compensation Expense	3.0
Allocated Share-based Compensation Expense, Net of Tax	2.2
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	6.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1.2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Grant Date Fair Value	$ 1.7

Employee Stock Purchase Plan, Maximum Payroll Deduction Percent

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Employee Stock Purchase Plan, Percent of Total Share Value

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- Definition

Equity-based compensation cost, net of tax, 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.

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No definition available.

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Total Grant Date Fair Value

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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.

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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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- Definition

Sum of the allocated, committed-to-be-released and suspense shares of the entity held by the plan.

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-Name Statement of Position (SOP)

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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.

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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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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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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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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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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 difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Net number of share options (or share units) granted during the period.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Aggregate change in value for stock issued during the period as a result of employee stock purchase plan.

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The amount authorized by an entity's Board of Directors under a stock repurchase plan.

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The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

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