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Stock Incentive Compensation and Employee Benefit Plans (Narrative) (Details) | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) Days shares | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2013 | May 16, 2016 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Total fair value of shares and share units vested | $ 56,900,000 | $ 54,500,000 | $ 34,000,000 |  |
Cash received from exercises of stock options during the period | 0 | 0 | 100,000 |  |
Excess windfall tax benefit realized by the Company due to its net operating loss position in the taxable jurisdictions in which it operates | 0 |  |  |  |
Total stock compensation expense recognized | 37,200,000 | 47,400,000 | 38,300,000 |  |
Contributions to defined contribution pension plans | $ 4,400,000 | $ 4,000,000 | $ 4,300,000 |  |
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 | 1,762,125 |  |  |  |
2001 Stock Incentive Plan and 2010 Performance Share Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) | shares | 0 |  |  |  |
Employee Stock Option | 2001 Stock Incentive Plan |  |  |  |  |
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 |  |  |  |
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected forfeiture rate |  | 0.00% |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 29,100,000 |  |  |  |
Periods for recognition of compensation costs not yet recognized | 1 year 8 months 12 days |  |  |  |
Restricted Stock | 2001 Stock Incentive Plan and 2016 Long-Term Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock incentive compensation, vesting period | 4 years |  |  |  |
Restricted Stock | Non-Employee Director Stock Incentive Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock incentive compensation, vesting period | 3 years |  |  |  |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock incentive compensation, vesting period | 3 years |  |  | 4 years |
Vesting maximum as a percentage of target if performance goal are achieved | 250.00% |  |  |  |
Period for average closing share price to determine total shareholder return | Days | 20 |  |  |  |
Expected forfeiture rate |  | 0.00% |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 4,100,000 |  |  |  |
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 |  |  |  |
Expected forfeiture rate |  | 13.00% |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Unrecognized compensation costs related to restricted stock awards | $ 21,900,000 |  |  |  |
Periods for recognition of compensation costs not yet recognized | 1 year 7 months 6 days |  |  |  |

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- Definition Total shareholder return is based on the average closing share price over the specified number of trading days preceding and including the start and end of the performance period. + References No definition available. + Details
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- Definition Share-based Compensation Arrangements by Share-based Payment Award, Fair Value Assumptions, Expected Forfeiture Rate + References No definition available. + Details
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- Definition Vesting Maximum, as a Percentage of Target, if Performance Goals are Achieved + References No definition available. + Details
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=96864182&loc=d3e11374-113907 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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