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Stock Incentive Compensation and Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | May 16, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of shares and share units vested | $ 46.3 | $ 54.7 | $ 41.6 |
Excess windfall tax benefit | 0.2 |  |  |
Excess windfall tax benefit realized by the Company due to its net operating loss position in the taxable jurisdictions in which it operates |  | 0.3 | 0.2 |
Total stock compensation expense recognized | 40.0 | 43.7 | 41.4 |
Contributions to defined contribution pension plans | 7.5 | $ 6.7 | $ 4.9 |
Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 66.7 |  |  |
Periods for recognition of compensation costs not yet recognized | 1 year 8 months 12 days |  |  |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive compensation, vesting period | 3 years |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 4.9 |  |  |
Periods for recognition of compensation costs not yet recognized | 1 year 8 months 12 days |  |  |
Cash Settled Restricted Stock Unit (CSRSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive compensation, vesting period | 4 years |  |  |
2016 Long-Term Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance (in shares) |  |  |  | 1,625,000
Number of shares available for grant (in shares) | 800,000 |  |  |
2016 Long-Term Incentive Plan | Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive compensation, vesting period | 4 years |  |  |
Granted May 2018 | Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting maximum as a percentage of target if performance goal are achieved | 200.00% |  |  |
Non-Employee Director Stock Incentive Plan | Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive compensation, vesting period | 3 years |  |  |

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