Stock-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 3.5	$ 4.4
Percentage of maximum number if shares to be issued (in hundredths)	100.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total intrinsic value of options exercised	0.5
Total unrecognized stock-based compensation expense	22.7
Weighted Average Remaining Vesting Period (Years)	1 year 10 months 6 days
Performance-based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.8	2.7
Percentage of actual number of shares issuable, maximum (in hundredths)	0.00%
Percentage of actual number of shares issuable, minimum (in hundredths)	200.00%
Percentage of stock units released (in hundredths)	282.00%
Percentage of maximum number if shares to be issued (in hundredths)	300.00%
Share-based payment award [Roll forward]
Beginning balance (in shares)	0.3
Granted (in shares)	0.3
Vested (in shares)	0
Forfeited (in shares)	(0.3)
Ending balance (in shares)	0.3
Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share)	$ 58.52
Granted (in dollars per share)	$ 40.72
Vested (in dollars per share)	$ 0
Forfeited (in dollars per share)	$ 58.41
Ending balance (in dollars per share)	$ 40.72
Aggregate Intrinsic Value [Roll Forward]
Maximum number of shares to be awarded (in shares)	0.6
Aggregate intrinsic value of units outstanding	8.2
Aggregate intrinsic value of grants	14.9
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total unrecognized stock-based compensation expense	9.3
Weighted Average Remaining Vesting Period (Years)	1 year 9 months 25 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2.1	1.1
Share-based payment award options outstanding [Roll Forward]
Beginning Balance (in shares)	2.9
Granted (in shares)	0.6
Exercised (in shares)	0.3
Forfeited (in shares)	0
Ending balance (in shares)	3.2
Options exercisable (in shares)	2.2
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Beginning balance weighted average exercise price (dollars per share)	$ 17.00
Granted weighted average exercise price (dollars per share)	$ 38.91
Exercised weighted average exercise price (dollars per share)	$ 14.43
Terminated weighted average exercise price (dollars per share)	$ 0
Ending balance weighted average exercise price (dollars per share)	$ 21.19
Options exercisable weighted average exercise price (dollars per share)	$ 14.22
Ending balance weighted average remaining contractual term (in years)	6 years 7 months 17 days
Options exercisable weighted average remaining contractual term (in years)	5 years 2 months 26 days
Ending balance aggregate intrinsic value	30.9
Options exercisable aggregate intrinsic value	37.4
Total intrinsic value of options exercised	7.5	34.4
Total unrecognized stock-based compensation expense	8.4
Weighted Average Remaining Vesting Period (Years)	1 year 11 months 1 day
Restricted Stock Units And Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	0.6	0.6
Share-based payment award [Roll forward]
Beginning balance (in shares)	0.2
Granted (in shares)	0.1
Vested (in shares)	(0.2)
Forfeited (in shares)	0
Ending balance (in shares)	0.1
Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share)	$ 32.03
Granted (in dollars per share)	$ 46.06
Vested (in dollars per share)	$ 28.90
Forfeited (in dollars per share)	$ 0
Ending balance (in dollars per share)	$ 47.14
Aggregate Intrinsic Value [Roll Forward]
Ending balance, Aggregate Intrinsic Value	4.5
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total unrecognized stock-based compensation expense	$ 5.0
Weighted Average Remaining Vesting Period (Years)	1 year 9 months 11 days

Refers to the percentage of maximum number of actual shares issuable at the of performance period.

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Refers to the percentage of minimum number of actual shares issuable at the of performance period.

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The intrinsic 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, as calculated by applying the disclosed 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 equity instruments other than stock options outstanding under the plan as of the balance sheet date.

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

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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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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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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 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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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

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