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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Options Roll Forward |  |  |  |  |  |
Shares outstanding under option, Beginning Balance |  | 473,000 |  | 473,000 |  |
Weighted average exercise price, Beginning Balance |  | $ 17.47 |  | $ 17.47 |  |
Shares outstanding under option, Exercised |  |  |  | (473,000) |  |
Shares outstanding under option, Exercised, Weighted average exercise price |  |  |  | $ 17.47 |  |
Shares outstanding under option, Ending Balance | 0 |  |  | 0 |  | 473,000
Weighted average exercise price, Ending Balance |  |  |  |  |  | $ 17.47
Weighted average remaining contractual term |  |  |  |  |  | 1 month
Aggregate intrinsic value, outstanding |  |  |  |  |  | $ 10.4
Status of nonvested restricted stock |  |  |  |  |  |
Nonvested shares subject to restriction, Beginning Balance | 1,725,000 | 1,429,000 |  | 1,429,000 |  |
Nonvested shares subject to restriction, weighted average exercise price | $ 39.27 | $ 44.12 |  | $ 44.12 |  |
Restricted shares granted to employees | 27,000 | 777,000 |  |  |  |
Granted shares subject to restriction, weighted average exercise price | $ 41.13 | $ 40.07 |  |  |  |
Shares subject to restriction, Vested | (61,000) | (453,000) |  |  |  |
Vested shares subject to restriction, weighted average exercise price | $ 51.71 | $ 57.35 |  |  |  |
Shares subject to restriction, Forfeited | (28,000) | (28,000) |  |  |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 38.06 | $ 41.87 |  |  |  |
Nonvested shares subject to restriction, Ending Balance | 1,663,000 | 1,725,000 |  | 1,663,000 |  | 1,429,000
Nonvested shares subject to restriction, weighted average exercise price | $ 38.86 | $ 39.27 |  | $ 38.86 |  | $ 44.12
Restricted Stock [Member] |  |  |  |  |  |
Restricted stock compensation expense |  |  |  |  |  |
Restricted stock compensation expense | $ 6.7 |  | $ 6.7 | $ 13.5 | $ 13.1 |
Status of nonvested restricted stock |  |  |  |  |  |
Restricted shares granted to employees |  |  |  | 776,753 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | 41.4 |  |  | $ 41.4 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition |  |  |  | 2 years 1 month |  |
Performance Shares [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance share compensation expense | 2.3 |  | 2.1 | $ 5.4 | 5.1 |
Relative Revenue Growth Performance Share Plans [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance share compensation expense | $ 2.2 |  | $ 2.1 | $ 5.4 | $ 2.1 |
Stock Incentive Plan 2004 [Member] | Stock Option [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Term of award |  |  |  | 10 years |  |
2014 Stock Incentive Plan [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares available for grant | 4,800,000 |  |  | 4,800,000 |  |
Number of shares authorized | 8,000,000 |  |  | 8,000,000 |  |
First Half Vested | Restricted Stock [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 2 years |  |
Percent of awards vested |  |  |  | 50.00% |  |
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 |  |  |  | 26,919 |  |

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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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