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Stock Incentive Compensation and Employee Benefit Plans (Narrative) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) d shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | May 16, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total fair value of shares and share units vested | $ 54,700,000 | $ 41,600,000 | $ 37,200,000 |
Cash received from exercises of stock options during the period | 0 | 0 | 0 |
Excess windfall tax benefit realized by the Company due to its net operating loss position in the taxable jurisdictions in which it operates | 300,000 | 200,000 | 0 |
Total stock compensation expense recognized | 43,700,000 | 41,400,000 | 35,700,000 |
Contributions to defined contribution pension plans | 6,700,000 | $ 4,900,000 | $ 4,100,000 |
Restricted stock awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 62,500,000 |  |  |
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 |  |  |
Period for average closing share price to determine total shareholder return | d | 20 |  |  |
Performance period | 1 year |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 6,100,000 |  |  |
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 |  |  |
Restricted Stock Units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 500,000 |  |  |
Periods for recognition of compensation costs not yet recognized | 2 months 12 days |  |  |
2016 Long-Term Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares reserved for issuance (in shares) | shares |  |  |  | 1,625,000
Number of shares available for grant (in shares) | shares | 1,000,000.0 |  |  |
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 March 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 | 250.00% |  |  |
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% |  |  |
2001 Stock Incentive Plan | Employee Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock incentive compensation, vesting period | 4 years |  |  |
Share-based payment award, expiration period | 10 years |  |  |
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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