Defined Benefit Plans, Estimated Future Employer Contributions in Year Three

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- Definition

Defined Benefit Plans, Estimated Future Employer Contributions in Year Two

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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- Definition

Amount of contributions made by the employer to defined benefit plans.

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Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.

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Defined Benefit Plans (Details)	7 Months Ended	9 Months Ended	12 Months Ended
Defined Benefit Plans (Details)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 GBP (£)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 3,200,300,000	$ 3,200,300,000	$ 3,200,300,000		$ 1,188,300,000	$ 1,247,600,000
Fair value of plan assets	3,108,700,000	3,108,700,000	3,108,700,000		1,092,600,000	1,122,700,000
Net liability	91,600,000	91,600,000	91,600,000		95,700,000	124,900,000
Net periodic pension cost			10,100,000		11,800,000	$ 9,600,000
Curtailment gain			1,400,000		$ 7,900,000
Contributions expected in next fiscal year			88,200,000
Cable & Wireless Superannuation Fund [Member] \| CWC [Member]
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	1,675,700,000	1,675,700,000	1,675,700,000
Fair value of plan assets	1,666,000,000.0	1,666,000,000.0	1,666,000,000.0
Net liability	9,700,000	9,700,000	9,700,000
Contributions	1,100,000	44,300,000
Contributions expected in next fiscal year			29,600,000
Cable & Wireless Superannuation Fund [Member] \| CWC [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions expected in next fiscal year \| £				£ 0
Defined Benefit Plans, Estimated Future Employer Contributions in Year Two \| £				0
Defined Benefit Plans, Estimated Future Employer Contributions in Year Three \| £				£ 0
Cable & Wireless Superannuation Fund [Member] \| CWC [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions expected in next fiscal year			28,400,000
Defined Benefit Plans, Estimated Future Employer Contributions in Year Two			28,400,000.0
Defined Benefit Plans, Estimated Future Employer Contributions in Year Three			28,400,000.0
Cable & Wireless Superannuation Fund [Member] \| CWC [Member] \| Letter of Credit [Member]
Defined Benefit Plan Disclosure [Line Items]
Facility amount	123,500,000	123,500,000	123,500,000
Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,707,400,000	1,707,400,000	1,707,400,000
Significant other observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	199,100,000	199,100,000	199,100,000
Significant unobservable inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,202,200,000	1,202,200,000	1,202,200,000
Significant unobservable inputs (Level 3) \| Cable & Wireless Superannuation Fund [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 1,018,300,000	$ 1,018,300,000	$ 1,018,300,000