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Stock-Based Compensation Plans (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Jan. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common stock available under stock option plan (in shares) | 11,230,386 |  |  |
Vesting period | 3 years |  |  |
Options, outstanding, number (in shares) | 114,943 |  |  |
Options, grants in period, gross (in shares) | 0 | 0 |  |
Plan 2020 |  |  |  |
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
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 | $ 45.2 |  | $ 18.7 |
Equity instruments other than options, vested in period, fair value | 23.4 | $ 18.1 |  |
Allocated share-based compensation expense, net of tax | 7.6 | 11.1 |  |
Allocated share-based compensation expense | $ 9.8 | $ 14.3 |  |
Equity instruments other than options, nonvested, number (in shares) | 1,740,643 |  | 1,373,657 |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 36 months |  |  |
Equity instruments other than options, nonvested, number (in shares) | 526,000 |  |  |
Total shareholder return performance measure, as a percentage | 15.00% |  |  |
Estimated vesting of shares based on performance shares (in shares) | 496,000 |  |  |
Minimum | Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options, vested and expected to vest, exercisable, number (in shares) | 0 |  |  |
Minimum | Performance Shares | 2019 and 2020 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting rights, percentage | 0.00% |  |  |
Minimum | Performance Shares | 2021 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting rights, percentage | 0.00% |  |  |
Maximum | Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options, vested and expected to vest, exercisable, number (in shares) | 1,101,000 |  |  |
Maximum | Performance Shares | 2019 and 2020 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting rights, percentage | 200.00% |  |  |
Maximum | Performance Shares | 2021 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting rights, percentage | 230.00% |  |  |

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