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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
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 | 247,073 |
Stock-Based Compensation Activity |  |
Income tax benefit | $ 0.5 | $ 0.8
Treasury Stock, Shares, Acquired | 255,000 |
Treasury Stock Acquired, Average Cost Per Share | $ 38.04 |
Enable Midstream Partners [Member] |  |
Stock-Based Compensation Activity |  |
Proceeds from Equity Method Investment, Distribution | $ 36.7 | 35.3
Performance Shares [Member] |  |
Stock-Based Compensation Activity |  |
Compensation expense | $ 1.9 | 2.7
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 | 201,552 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 38.03 |
Restricted Stock [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 | 67,193 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ 43.69 |
Stock-Based Compensation Activity |  |
Compensation expense | $ 0.1 | 0.3
Share-based Payment Arrangement [Member] |  |
Stock-Based Compensation Activity |  |
Compensation expense | 2.0 | 3.0
Total Shareholder Return [Member] | Performance Shares [Member] |  |
Stock-Based Compensation Activity |  |
Compensation expense | 1.7 | 2.2
Performance Units Related to Earnings Per Share [Member] | Performance Shares [Member] |  |
Stock-Based Compensation Activity |  |
Compensation expense | $ 0.2 | $ 0.5

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- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21D -URI http://asc.fasb.org/extlink&oid=118932676&loc=SL94080555-108585 + Details
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