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Share-Based Compensation Textuals (Details) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) years shares | Apr. 01, 2017 shares
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Unrecognized compensation cost related to nonvested awards net of tax Total | $ |  | $ 27.7 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  |  | 2 years 6 months |
Unrecognized compensation cost period for recognition, weighted-average, years | years |  |  | 0.6 |
Common Stock |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Number of Shares Authorized |  | 8,900,000 |  |
Effect of Plan | 2017 Incentive Plan |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Common stock reserved for future issuance |  |  |  | 14,000,000
Deferred Stock Units |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Vesting period of performance units |  |  | 3 years |
Restricted Stock Units (RSUs) |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Vesting period of performance units |  |  | 3 years |
Total fair value of restricted stock units granted | $ | $ 79.8 | $ 19.8 | $ 18.2 |
Nonvested dividend equivalent units |  | 1,706,025 | 2,641,087 |
Total fair value of restricted stock units vested | $ | $ 0.9 | $ 40.3 | $ 46.2 |
Performance Units, Grants |  | 664,899 |  |
Dividend Equivalent Units |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Nonvested dividend equivalent units |  | 176,000 |  |
Performance Units |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Nonvested dividend equivalent units |  | 426,606 | 206,630 |
Performance Units, Grants | 0 | 264,918 |  |
Dividend Equivalent Units, Performance Shares [Domain] |  |  |  |
Share-Based Compensation Expense and Cash Flows (Line Items) |  |  |  |
Nonvested dividend equivalent units |  | 44,000 |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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