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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Options Roll Forward |  |  |
Shares outstanding under option, Beginning Balance | 473,000 |  |
Weighted average exercise price, Beginning Balance | $ 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 |  | 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 | 1,429,000 |  |
Nonvested shares subject to restriction, weighted average exercise price | $ 44.12 |  |
Restricted shares granted to employees | 777,000 |  |
Granted shares subject to restriction, weighted average exercise price | $ 40.07 |  |
Shares subject to restriction, Vested | (453,000) |  |
Vested shares subject to restriction, weighted average exercise price | $ 57.35 |  |
Shares subject to restriction, Forfeited | (28,000) |  |
Forfeited shares subject to restriction, weighted average exercise price | $ 41.87 |  |
Nonvested shares subject to restriction, Ending Balance | 1,725,000 |  | 1,429,000
Nonvested shares subject to restriction, weighted average exercise price | $ 39.27 |  | $ 44.12
Restricted Stock [Member] |  |  |
Restricted stock compensation expense |  |  |
Restricted stock compensation expense | $ 6.8 | $ 6.4 |
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 | $ 47.0 |  |
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition | 2 years 3 months |  |
Performance Shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share compensation expense | $ 3.1 | $ 3.0 |
Relative Revenue Growth Performance Share Plans [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Performance share compensation expense | $ 3.2 |  |
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 |  |
Number of shares authorized | 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 |  |

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- Definition 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. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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