v3.10.0.1

Stock-based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares) | 1,441,744 |  |
Stock based compensation expense | $ 28.2 | $ 27.4 | $ 21.5
Tax benefit from exercise of stock options | 6.9 | 10.4 | 8.2
Excess tax benefit from share-based compensation, operating activities | $ 5.7 | $ 1.1 | $ 0.7
Stock options granted (in shares) | 361,000 | 518,000 | 634,000
Aggregate Intrinsic value of options exercised | $ 6.6 | $ 2.6 | $ 0.4
Fair value of options vested | $ 3.5 | $ 1.7 | $ 1.4
2015 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Unexercised options lapse period (in years) | 10 years |  |
2001 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Unexercised options lapse period (in years) | 10 years |  |
Employee Stock |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Aggregate number of shares of common stock issued or transferred under the incentive stock awards plan (in shares) | 174,761 |  |
Compensation cost for ESPP | $ 0.2 |  |
Unrecognized compensation expense related to non-vested award | $ 24.6 |  |
Unrecognized compensation expense related to non-vested award, recognition period (in years) | 1 year 4 months 2 days |  |
Employee Stock | Minimum | 2015 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 1 year |  |
Employee Stock | Minimum | 2001 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 1 year |  |
Employee Stock | Maximum | 2015 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 3 years |  |
Employee Stock | Maximum | 2001 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 5 years |  |
Restricted Stock |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock granted (in shares) | 248,000 | 375,000 | 379,000
Weighted average grant date fair value (in dollars per share) | $ 46.01 | $ 29.27 | $ 22.81
Total fair value of shares vesting | $ 24.8 | $ 9.9 | $ 3.8
Restricted Stock | Executive Officer Performance Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 3 years |  |
Restricted Stock | Minimum | 2015 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 1 year |  |
Restricted Stock | Minimum | 2001 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 1 year |  |
Restricted Stock | Minimum | AMP Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 4 years |  |
Restricted Stock | Maximum | 2015 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 3 years |  |
Restricted Stock | Maximum | 2001 Incentive Award Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 5 years |  |
Restricted Stock | Maximum | AMP Plan |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 5 years |  |
Performance Share Units |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Stock granted (in shares) | 486,000 |  |
Weighted average grant date fair value (in dollars per share) | $ 38.51 |  |
Total fair value of shares vesting | $ 22.6 | $ 7.9 | $ 3.4
Performance Share Units | Minimum |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Performance percentage | 0.00% |  |
Performance Share Units | Maximum |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Performance percentage | 200.00% |  |
Performance criteria is met | Performance Share Units |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Award vesting rights (percentage) | 33.33% |  |
One-year service period | Performance Share Units |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Vesting period (in years) | 1 year |  |
Award vesting rights (percentage) | 33.33% |  |
Award requisite service period (in years) | 1 year |  |
Two-year service period | Performance Share Units |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Award vesting rights (percentage) | 33.33% |  |
Award requisite service period (in years) | 2 years |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Net number of share options (or share units) granted during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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