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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 grant-date intrinsic value of other than options granted during the reporting period as calculated by applying the disclosed pricing methodology.

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

+ References

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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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Period 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, 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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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 as a result of the occurrence of a terminating event.

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

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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.

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

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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Stock-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 4.7	$ 3.0	$ 8.2	$ 7.4
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total unrecognized stock-based compensation expense	16.3		16.3
Weighted Average Remaining Vesting Period (Years)			1 year 5 months 1 day
Performance-based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.2	1.4	2.0	4.1
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		0.3
Weighted Average Grant Date Fair Value [Abstract]
Beginning balance (in dollars per share)			$ 58.52
Granted (in dollars per share)			$ 39.33
Vested (in dollars per share)			$ 0
Forfeited (in dollars per share)			$ 57.07
Ending balance (in dollars per share)	$ 39.27		$ 39.27
Aggregate Intrinsic Value [Roll Forward]
Ending balance, Aggregate Intrinsic Value	11.2		11.2
Maximum number of shares to be awarded (in shares)	0.6		0.6
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	2.4		2.4
Weighted Average Remaining Vesting Period (Years)			1 year 3 months 4 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	2.1	1.1	4.2	2.3
Share-based payment award options outstanding [Roll Forward]
Beginning Balance (in shares)			2.9
Granted (in shares)			0.6
Forfeited (in shares)			(0.1)
Exercised (in shares)			(0.4)
Ending balance (in shares)	3.1		3.1
Options exercisable (in shares)	2.0		2.0
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)			$ 39.70
Terminated weighted average exercise price (dollars per share)			$ 39.58
Exercised weighted average exercise price (dollars per share)			$ 13.21
Ending balance weighted average exercise price (dollars per share)	$ 21.80		$ 21.80
Options exercisable weighted average exercise price (dollars per share)	$ 14.44		$ 14.44
Ending balance weighted average remaining contractual term (in years)			6 years 5 months 8 days
Options exercisable weighted average remaining contractual term (in years)			4 years 11 months 23 days
Ending balance aggregate intrinsic value	62.2		62.2
Options exercisable aggregate intrinsic value	60.4		60.4
Total intrinsic value of options exercised	4.4	12.6	12.4	39.1
Total unrecognized stock-based compensation expense	7.6		7.6
Weighted Average Remaining Vesting Period (Years)			1 year 7 months 17 days
Restricted Stock Units And Deferred Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	1.4	0.5	2.0	1.0
Share-based payment award [Roll forward]
Beginning balance (in shares)			0.2
Granted (in shares)			0.2
Vested (in shares)			(0.2)
Forfeited (in shares)			0
Ending balance (in shares)	0.2		0.2
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)			$ 29.39
Forfeited (in dollars per share)			$ 0
Ending balance (in dollars per share)	$ 47.40		$ 47.40
Aggregate Intrinsic Value [Roll Forward]
Ending balance, Aggregate Intrinsic Value	9.0		9.0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Total unrecognized stock-based compensation expense	6.3		6.3
Weighted Average Remaining Vesting Period (Years)			1 year 2 months 19 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Award vesting period	1 year		1 year
Aggregate intrinsic value of RSU's	$ 5.9		$ 6.4
Deferred Stock Units (DSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Award vesting period	1 year		1 year