Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Exercisable Intrinsic Value

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Other Than Options, Exercises in Period, Total Intrinsic Value

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Outstanding Intrinsic Value.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Other Than Options Weighted Average Remaining Contractual Term.

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award, Restriction on Transferability of awards

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Share-based Compensation, Percentage of Target Award Which Participant May Earn

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Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued

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Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Withheld for Taxes

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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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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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Unrecognized cost of unvested share-based compensation awards.

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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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- Definition

The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes.

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Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 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 number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Net number of non-option equity instruments granted to participants.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares issued during the period related to Restricted Stock Awards, net of any shares forfeited.

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Stock Incentive Plan (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended	8 Months Ended	12 Months Ended
	Jan. 23, 2018	Apr. 28, 2016	Feb. 28, 2019	Mar. 31, 2018	Dec. 31, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Common stock, shares issuable (in shares)						150,000,000	150,000,000
Compensation cost related to unearned performance awards						$ 31.6
Recognition period						2 years
Total stock compensation expense						$ 46.6	$ 38.4	$ 18.4
Excess tax benefit of stock awards						$ 1.6	$ 0.1	$ 0.1
Shares available for grant (in shares)						3,436,426
Long Term Incentive Plan \| Minimum
Target award percentages						33.00%
Long Term Incentive Plan \| Maximum
Target award percentages						200.00%
Performance Shares
Shares awarded (in shares)	273,665					441,740
Weighted average grant-date fair value of performance awards granted (in dollars per share)						$ 71.40	$ 61.94	$ 47.93
Number of shares not vested (in shares)						938,862	1,645,078
Shares earned (in shares)						1,066,024
Waived Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost				$ 4.8
Restricted Stock Units (RSUs)
Performance period						3 years
Shares awarded (in shares)	131,116					247,404
Compensation cost related to unearned performance awards						$ 14.2
Recognition period						2 years
Weighted average grant-date fair value of performance awards granted (in dollars per share)						$ 63.99	$ 61.99
Number of shares not vested (in shares)						352,975	237,468
Shares earned (in shares)						120,202
Stock Appreciation Rights (SARs)
Vesting period						4 years
Compensation cost related to unearned performance awards						$ 3.8
Recognition period						2 years
Weighted average grant-date fair value of performance awards granted (in dollars per share)						$ 12.88	$ 11.45	$ 7.98
SSAR Expiration Period						7 years
Total stock compensation expense						$ 2.4	$ 3.0	$ 3.8
Weighted average remaining contractual life of SSARs outstanding, in years						4 years
Total fair value of SSARs vested						$ 2.8
Number of shares not vested (in shares)						578,725
Total intrinsic value of outstanding SSARs						$ 5.2
Total intrinsic value of exercisable of SSARs						3.1
Total intrinsic value of SSARs exercised						$ 1.5
SSARs granted (in shares)	243,600					157,700
Restricted Stock
Total stock compensation expense						$ 1.1
Weighted-average period for compensation cost expected to be recognized, in years					1 year
Restricted common stocks issued (in shares)		17,226
Restricted common stocks issued after shares withheld for taxes (in shares)		12,629
Long Term Incentive Plan
Performance period						3 years
2006 Plan
Common stock, shares issuable (in shares)						10,000,000
Subsequent Event [Member]
Shares earned (in shares)			839,090
Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Issued			521,888
Share-based compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Shares Withheld for Taxes			317,202