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Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of Shares Authorized |  | 7,400,000 |  |
Tax Benefit from Compensation Expense |  | $ 3.5 | $ 1.8 | $ 3.1
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |  |
Minimum payout range |  | 0.00% |  |
Maximum payout range |  | 200.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Total Compensation Cost Not yet Recognized |  | $ 11.2 |  |
Performance Units Related to Earnings Per Share [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 86,857 | 94,735 | 88,156
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 34.83 | $ 26.64 | $ 33.99
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |  | 241,518 | 221,350 |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 86,857 | 94,735 | 88,156
Equity Instruments Other than Options, Converted in Period |  | (61,742) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (4,947) |  |
Awards Other than Options, Fully Vested |  | 67,148 |  |
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value | [1] | $ 0.0 |  |
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value |  | 1.2 |  |
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value |  | 7.2 |  |
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value |  | $ 5.7 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance |  | 159,608 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 86,857 | 94,735 | 88,156
Equity Instruments Other than Options, Vested in Period |  | (67,148) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (4,947) |  |
Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  | 174,370 | 159,608 |
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value |  | $ 30.58 | $ 29.71 |
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | 34.83 | $ 26.64 | $ 33.99
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value |  | 33.99 |  |
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  | $ 31.12 |  |
Awards Other than Options, Vested and Expected to Vest, Outstanding | [2] | 164,148 |  |
Fair Value of Vested Performance Units and Restricted Stock |  | $ 1.2 | $ 0.0 | $ 0.0
Total Compensation Cost Not yet Recognized |  | $ 2.6 |  |
Total Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 8 months 1 day |  |
Total Shareholder Return [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 260,570 | 284,211 | 264,454
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 41.77 | $ 20.97 | $ 31.02
Expected Dividend Rate |  | 3.80% | 3.50% | 2.60%
Expected Volatility Rate |  | 19.90% | 19.80% | 16.90%
Risk Free Interest Rate |  | 1.44% | 0.88% | 0.91%
Expected Term |  | 2 years 9 months 18 days | 2 years 10 months 2 days | 2 years 10 months 6 days
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |  | 724,551 | 664,045 |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 260,570 | 284,211 | 264,454
Equity Instruments Other than Options, Converted in Period |  | (185,214) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (14,850) |  |
Awards Other than Options, Fully Vested |  | 201,431 |  |
Equity Instruments Other than Options, Converted, Aggregrate Intrinsic Value | [1] | $ 0.0 |  |
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value |  | 0.0 |  |
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value |  | 2.4 |  |
Equity Instruments Other than Options, Fully Vested, Aggregrate Intrinsic Value |  | $ 2.3 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance |  | 478,831 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 260,570 | 284,211 | 264,454
Equity Instruments Other than Options, Vested in Period |  | (201,431) |  |
Equity Instruments Other than Options, Forfeited in Period |  | (14,850) |  |
Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  | 523,120 | 478,831 |
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value |  | $ 30.96 | $ 25.16 |
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | 41.77 | $ 20.97 | $ 31.02
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value |  | 31.18 |  |
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  | $ 31.01 |  |
Awards Other than Options, Vested and Expected to Vest, Outstanding | [2] | 492,446 |  |
Fair Value of Vested Performance Units and Restricted Stock |  | $ 6.3 | $ 6.4 | $ 8.5
Total Compensation Cost Not yet Recognized |  | $ 8.5 |  |
Total Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 9 months |  |
Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation Expense |  | $ 9.0 | 4.5 | 8.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Total Compensation Cost Not yet Recognized |  | 11.1 |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation Expense |  | $ 0.1 | $ 0.1 | $ 0.1
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 3,145 | 1,881 | 958
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 34.96 | $ 29.27 | $ 26.11
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number |  | 4,242 | 4,912 |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 3,145 | 1,881 | 958
Equity Instruments Other than Options, Forfeited in Period |  | 0 |  |
Equity Instruments Other than Options, Vested in Period, Aggregate Intrinsic Value |  | $ 0.1 |  |
Equity Instruments Other than Options, Outstanding, Aggregrate Intrinsic Value |  | $ 0.1 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |
Equity Instruments Other than Options, Nonvested, Number, Beginning Balance |  | 4,912 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted |  | 3,145 | 1,881 | 958
Equity Instruments Other than Options, Vested in Period |  | (3,815) |  |
Equity Instruments Other than Options, Forfeited in Period |  | 0 |  |
Equity Instruments Other than Options, Nonvested, Number, Ending Balance |  | 4,242 | 4,912 |
Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value |  | $ 33.58 | $ 31.29 |
Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  | 34.96 | $ 29.27 | $ 26.11
Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value |  | 31.71 |  |
Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  | $ 0.00 |  |
Awards Other than Options, Vested and Expected to Vest, Outstanding |  | 4,242 |  |
Fair Value of Vested Performance Units and Restricted Stock |  | $ 0.1 | $ 0.1 | $ 0.2
Total Compensation Cost Not yet Recognized |  | $ 0.1 |  |
Total Compensation Cost Not yet Recognized, Period for Recognition |  | 1 year 4 months 2 days |  |
Stock Compensation Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation Expense |  | $ 9.1 | 4.6 | 8.4
Amount paid by unconsolidated affiliates |  | 0.0 | 0.0 | 0.5
Compensation Expense, Net of Unconsolidated Affiliates |  | 9.1 | 4.6 | 7.9
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation Expense |  | 1.4 | 0.0 | 0.7
Total Shareholder Return [Member] | Performance Shares [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation Expense |  | $ 7.6 | $ 4.5 | $ 7.6
Common Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures |  | 2,298 | 2,100 | 82,046
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares Paid for Tax Withholding |  | 146 |  |
[1] | These amounts represent performance units that vested at December 31, 2016 which were settled in February 2017.
[2] | The intrinsic value of the performance units based on total shareholder return and earnings per share is $2.3 million

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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 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. + 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 total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the 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 (h)(1)(i) -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 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=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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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested 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)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + 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 (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Intrinsic value of equity-based compensation awards not vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options. + References No definition available. + Details
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- Definition Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options. + References No definition available. + Details
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- Definition Expected term of share-based compensation awards, 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 (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: 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.D.2) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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