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Employee Retirement Plans - Global Marine Personal Pension Plan Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	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.

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- Definition

Defined contribution plan employer matching contribution additional percent of match.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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