Share-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Share-Based Compensation [Abstract]
Share-based compensation	$ 8.0	$ 13.3
Deferred share-based compensation on restricted share awards	5.5
Income tax benefits from share-based compensation	5.3	2.6
Shares available for future grant (in shares)	7,575,686
Unvested stock options decrease in period (in shares)	115,068
Stock-option transactions under the terms of the LTSIP [Abstract]
Options outstanding, beginning balance (in shares)	2,560,059
Exercised (in shares)	(432,700)
Options outstanding, ending balance (in shares)	2,127,359
Stock-option transactions under the terms of the LTSIP , additional disclosures [Abstract]
Minimum exercise price of options outstanding, beginning of period (in dollars per share)	$ 3.70
Maximum exercise price of options outstanding, beginning of the period (in dollars per share)	$ 17.35
Minimum exercise price of options exercised during the period (in dollars per share)	$ 3.70
Maximum exercise price of options exercised during the period (in dollars per share)	$ 13.10
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 3.70
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 17.35
Weighted-average exercise price, beginning of period (in dollars per share)	$ 7.30
Weighted average exercise price of options exercised during the period (in dollars per share)	$ 5.09
Weighted-average exercise price, end of period (in dollars per share)	$ 7.74
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 3.70
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 17.35
Options outstanding, Ending balance (in shares)	2,127,359
Options outstanding, Weighted-average remaining term in years	2.3
Weighted-average exercise price, end of period (in dollars per share)	$ 7.74
Options exercisable, Ending Balance (in shares)	2,009,565
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 7.48
Unvested Options, Ending Balance (in shares)	117,794
Unvested Options, Weighted-average exercise price (in dollars per share)	$ 12.25
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted shares, Weighted-average Vesting Period (in months)	17M
Number of restricted stock units issued (in shares)	68,519
Weighted-average price of restricted stock units issued (in dollars per share)	$ 15.31
Weighted-average vesting period of restricted stock units issued (in months)	9M
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted under award plan (in shares)	128,021
Performance period (in years) that the target number of performance shares for each executive officer is subject to adjustment based on the company's performance	3
The date actual performance shares awarded will be distributed	first quarter of 2014
Grant-date fair value of the award	$ 18.23
Share compensation expense for the period	$ 0.6
Restricted share transactions under the terms of the LTSIP Roll Forward]
Granted (in shares)	128,021
Restricted share transactions under the terms of the LTSIP, additional disclosures [Abstract]
Weighted-average price, restricted shares granted (in dollars per share)	$ 18.23
Restricted Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted under award plan (in shares)	348,127
Grant-date fair value of the award	$ 17.96
Restricted share transactions under the terms of the LTSIP Roll Forward]
Unvested restricted shares, beginning balance (recast) (in shares)	568,707
Granted (in shares)	348,127
Distributed (in shares)	(133,391)
Forfeited (in shares)	(11,893)
Unvested restricted shares, ending balance (in shares)	771,550
Restricted share transactions under the terms of the LTSIP, additional disclosures [Abstract]
Minimum price of unvested restricted shares, beginning of period (in dollars per share)	$ 11.40
Maximum price of unvested restricted shares, beginning of the period (in dollars per share)	$ 20.31
Minimum price of unvested restricted shares, granted (in dollars per share)	$ 17.50
Maximum price of unvested restricted shares, granted (in dollars per share)	$ 17.97
Minimum price of unvested restricted shares, distributed (in dollars per share)	$ 11.40
Maximum price of unvested restricted shares, distributed (in dollars per share)	$ 20.31
Minimum price of unvested restricted shares, forfeited(in dollars per share)	$ 11.40
Maximum price of unvested restricted shares, forfeited (in dollars per share)	$ 17.97
Minimum price of unvested restricted shares, end of period (in dollars per share)	$ 11.40
Maximum price of unvested restricted shares, end of period (in dollars per share)	$ 17.97
Weighted-average price, beginning of period (in dollars per share)	$ 14.66
Weighted-average price, restricted shares granted (in dollars per share)	$ 17.96
Weighted-average price, restricted shares distributed (in dollars per share)	$ 14.09
Weighted-average price, restricted shares forfeited (in dollars per share)	$ 16.45
Weighted-average price, end of period (in dollars per share)	$ 16.22
Options Outstanding Exercise Price Range 1 [Member]
Stock-option transactions under the terms of the LTSIP [Abstract]
Options outstanding, ending balance (in shares)	1,144,985
Stock-option transactions under the terms of the LTSIP , additional disclosures [Abstract]
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 3.70
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 4.37
Weighted-average exercise price, end of period (in dollars per share)	$ 4.12
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 3.70
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 4.37
Options outstanding, Ending balance (in shares)	1,144,985
Options outstanding, Weighted-average remaining term in years	1.0
Weighted-average exercise price, end of period (in dollars per share)	$ 4.12
Options exercisable, Ending Balance (in shares)	1,144,985
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 4.12
Unvested Options, Ending Balance (in shares)	0
Unvested Options, Weighted-average exercise price (in dollars per share)	$ 0
Options Outstanding Exercise Price Range 2 [Member]
Stock-option transactions under the terms of the LTSIP [Abstract]
Options outstanding, ending balance (in shares)	649,174
Stock-option transactions under the terms of the LTSIP , additional disclosures [Abstract]
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 7.84
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 12.43
Weighted-average exercise price, end of period (in dollars per share)	$ 11.17
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 7.84
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 12.43
Options outstanding, Ending balance (in shares)	649,174
Options outstanding, Weighted-average remaining term in years	3.2
Weighted-average exercise price, end of period (in dollars per share)	$ 11.17
Options exercisable, Ending Balance (in shares)	590,177
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 11.15
Unvested Options, Ending Balance (in shares)	58,997
Unvested Options, Weighted-average exercise price (in dollars per share)	$ 11.40
Options Outstanding Exercise Price Range 3 [Member]
Stock-option transactions under the terms of the LTSIP [Abstract]
Options outstanding, ending balance (in shares)	333,200
Stock-option transactions under the terms of the LTSIP , additional disclosures [Abstract]
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 13.10
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 17.35
Weighted-average exercise price, end of period (in dollars per share)	$ 13.52
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Minimum exercise price of options outstanding, end of period (in dollars per share)	$ 13.10
Maximum exercise price of options outstanding, end of period (in dollars per share)	$ 17.35
Options outstanding, Ending balance (in shares)	333,200
Options outstanding, Weighted-average remaining term in years	4.8
Weighted-average exercise price, end of period (in dollars per share)	$ 13.52
Options exercisable, Ending Balance (in shares)	274,403
Options exercisable, Weighted-average exercise price (in dollars per share)	$ 13.60
Unvested Options, Ending Balance (in shares)	58,797
Unvested Options, Weighted-average exercise price (in dollars per share)	$ 13.10

The number of restricted stock units issued during the period.

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

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The weighted average fair value at grant for nonvested share-based awards issued during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan), transferred to the equity method investee due to Spinoff.

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The number of years the target number of performance shares for each executive officer is subject to adjustment upward or downward based on the company's performance with respect to specified performance criteria relative to a specified peer group of companies.

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The maximum exercise price of options exercised during the reporting period

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The minimum exercise price of options exercised during the reporting period

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The number of outstanding awards on stock option plans 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.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are nonvested.

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The maximum exercise price within a price range of options outstanding.

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The minimum exercise price within a price range of options outstanding.

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The decrease in the number of unvested stock options, or conversely, the number of stock options vested during the period.

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The maximum price within a price range of unvested restricted shares.

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The minimum price within a price range of unvested restricted shares.

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The maximum price at which unvested restricted shares are forfeited under the plan

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The minimum price at which unvested restricted shares are forfeited under the plan

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The maximum price at which granted unvested restricted shares are converted into shares under the plan

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The minimum price at which granted unvested restricted shares are converted into shares under the plan

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The maximum price at which unvested restricted shares are converted into shares and distributed under the plan

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The minimum price at which unvested restricted shares are converted into shares and distributed under the plan

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The time period in which the shares awarded will be distributed as long as such executive officer was employed by the company or its affiliates.

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The weighted average fair value at grant for nonvested restricted stock units issued during the period.

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Description of the period of time over which an employee's right to exercise a restricted stock unit award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, 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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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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Share-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 shares under a share-based award plan other than a stock option plan that were settled during the reporting period due to a failure to satisfy vesting conditions pertaining to all option plans.

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The number of shares issuable under a share-based award plan pertaining to grants made during the period on other than stock option plans (for example, phantom stock plan, stock appreciation rights plan, performance target plan).

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The number of outstanding awards on nonstock option plans (for example, phantom stock plan, stock 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.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on share-based plans excluding option plans (for example, phantom stock plan, stock 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.

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The decrease in the number of shares potentially issuable under a share-based award plan pertaining to awards for which the grantee has gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

+ References

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The decrease in the number of reserved shares that could potentially be issued attributable to the exercise or conversion during the reporting period of previously issued stock options under the option plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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-Subparagraph b(1)(e)

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(b)

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- Definition

The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a)

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ Details

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance-sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

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- Definition

The weighted-average period remaining as of the balance-sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph d(1)

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