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Employee Retirement Plans - Global Marine Personal Pension Plan Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit, maximum employees contributions percentage | 6.00% |
Defined benefit, matching contribution amount | $ 0.1 | $ 0.1
Global Marine Personal Pension Plan | Global Marine Personal Pension Plan |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit, minimum employees contributions percentage | 2.00% |
Defined benefit, maximum employees contributions percentage | 7.50% |
Defined benefit, employer matching rate plus an additional fixed contributions percentage (as a percent) | 5.00% |
Defined benefit, matching contribution amount | $ 1.4 | $ 1.7
Global Marine Personal Pension Plan | Global Marine Personal Pension Plan | Ex Care |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Defined benefit, minimum employees contributions percentage | 2.50% |
Defined benefit, maximum employees contributions percentage | 7.50% |

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- Definition Defined contribution plan annual contribution per employee percent. + References No definition available. + Details
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- Definition Defined contribution plan employer matching contribution additional percent of match. + References No definition available. + 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 Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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- Details
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- Details
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- Details
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