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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 8 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Feb. 28, 2019
Status of nonvested restricted stock |  |  |  |  |  |
Net impact due to stock awards modification | $ (4.1) |  |  |  |  |
Restricted Stock [Member] |  |  |  |  |  |
Restricted stock compensation expense |  |  |  |  |  |
Restricted stock compensation expense | 5.4 |  | $ 6.7 | $ 11.9 | $ 13.5 |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ 46.7 |  |  | $ 46.7 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years |  |
Status of nonvested restricted stock |  |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 1,725,000 | 1,593,000 |  | 1,593,000 |  | 1,583,000
Nonvested shares subject to restriction, weighted average exercise price | $ 43.26 | $ 38.86 |  | $ 38.86 |  | $ 43.03
Restricted shares granted to employees | 68,000 | 625,000 |  | 673,961 |  |
Granted shares subject to restriction, weighted average exercise price | $ 50.86 | $ 52.64 |  |  |  |
Shares subject to restriction, Vested | (68,000) | (486,000) |  |  |  |
Vested shares subject to restriction, weighted average exercise price | $ 51.11 | $ 41.05 |  |  |  |
Shares subject to restriction, Forfeited | (142,000) | (7,000) |  |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 45.68 | $ 49.48 |  |  |  |
Nonvested shares subject to restriction, Ending Balance | 1,583,000 | 1,725,000 |  | 1,583,000 |  |
Nonvested shares subject to restriction, weighted average exercise price | $ 43.03 | $ 43.26 |  | $ 43.03 |  |
Performance Shares [Member] |  |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |  |
Performance share compensation expense | $ 0.5 |  | 2.3 | $ 2.2 | 5.4 |
Relative Revenue Growth Performance Share Plans [Member] |  |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 530,000 | 355,000 |  | 355,000 |  | 481,000
Nonvested shares subject to restriction, weighted average exercise price | $ 43.79 | $ 39.42 |  | $ 39.42 |  | $ 44.45
Restricted shares granted to employees | 95,000 | 175,000 |  |  |  |
Granted shares subject to restriction, weighted average exercise price | $ 50.20 | $ 52.64 |  |  |  |
Shares subject to restriction, Forfeited | (144,000) |  |  |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 45.82 |  |  |  |  |
Nonvested shares subject to restriction, Ending Balance | 481,000 | 530,000 |  | 481,000 |  |
Nonvested shares subject to restriction, weighted average exercise price | $ 44.45 | $ 43.79 |  | $ 44.45 |  |
Performance share compensation expense | $ 1.2 |  | $ 2.2 | $ 7.7 | $ 5.4 |
2018 Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized | 7,000,000 |  |  | 7,000,000 |  |
Number of shares available for grant | 6,900,000 |  |  | 6,900,000 |  |
First Half Vested | Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percent of awards vested |  |  |  | 50.00% |  |
Vesting period |  |  |  | 2 years |  |
Second Half Vested | Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Director [Member] | Restricted Stock [Member] |  |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |  |
Restricted shares granted to employees |  |  |  | 19,656 |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Status of nonvested restricted stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost |  |  |  |  |  | $ 15.8

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The noncash expense that represents the cost of restricted stock or unit distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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