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Stock-Based Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Options, outstanding, number (in shares) | 114,943 |  |
Options, grants in period, weighted average grant date fair value | $ 2.0 |  |
Nonvested awards, compensation cost not yet recognized, period for recognition | 3 years |  |
Options, grants in period, gross (in shares) | 0 | 0 |
Vested (in shares) | 0 | 0 |
Plan 2010 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized to issue under share based compensation plans (in shares) | 12,500,000 |  |
Common stock available under stock option plan (in shares) | 12,948,153 |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement age requirement to vest over original vesting period | 55 years |  |
Time in service requirement to vest over original vesting period | 10 years |  |
Nonvested awards, compensation cost not yet recognized, period for recognition | 2 years |  |
Nonvested awards, compensation cost not yet recognized | $ 43.0 |  | $ 23.4
Equity instruments other than options, vested in period, fair value | 18.1 | $ 13.8 |
Allocated share-based compensation expense, net of tax | 11.1 | 6.0 |
Allocated share-based compensation expense | $ 14.3 | $ 7.6 |
Equity instruments other than options, nonvested, number (in shares) | 1,791,129 |  | 1,690,600
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 36 months |  |
Shares forfeited (in shares) |  | 115,302 |
Decrease in stock-based compensation expense |  | $ 4.5 |
Equity instruments other than options, nonvested, number (in shares) | 605,000 |  |
Award requisite service period (in years) | 3 years |  |
Estimated vesting of shares based on performance shares (in shares) | 663,000 |  |
Minimum | Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 0.00% |  |
Options, vested and expected to vest, exercisable, number (in shares) | 0 |  |
Maximum | Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting rights, percentage | 200.00% |  |
Options, vested and expected to vest, exercisable, number (in shares) | 1,209,000 |  |

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