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Retirement Benefit Plans
 9 Months Ended
Sep. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
RETIREMENT BENEFIT PLANS
RETIREMENT BENEFIT PLANS
Defined Contribution Plans
The total amounts charged to the Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2015 of $13.8 million and $44.5 million, respectively (three and nine months ended September 30, 2014: $13.3 million and $43.0 million, respectively) represent contributions paid or payable to these plans by the company at rates specified in the rules of the plans. As of September 30, 2015, accrued contributions of $19.7 million (December 31, 2014: $25.4 million) for the current year will be paid to the plans.
Defined Benefit Plans
The components of net periodic benefit cost in respect of these defined benefit plans are as follows:
 
Retirement Plans
 
Medical Plan
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
For the three months ended September 30,
 
For the nine months ended September 30,
$ in millions
2015
 
2014
 
2015
 
2014
 
2015
 
2014
 
2015
 
2014
Service cost
1.1

 
1.1

 
3.6

 
3.3

 
—

 
0.1

 
—

 
0.2

Interest cost
5.4

 
4.8

 
15.9

 
14.3

 
—

 
0.4

 
—

 
1.4

Expected return on plan assets
(6.3
)
 
(4.6
)
 
(18.6
)
 
(13.9
)
 
(0.1
)
 
(0.2
)
 
(0.3
)
 
(0.5
)
Amortization of prior service cost/(credit)
—

 
—

 
0.1

 
0.1

 
(2.9
)
 
(0.5
)
 
(7.6
)
 
(1.5
)
Amortization of net actuarial (gain)/loss
0.7

 
0.5

 
2.0

 
1.5

 
—

 
—

 
—

 
0.2

Net periodic benefit cost/(benefit)
0.9

 
1.8

 
3.0

 
5.3

 
(3.0
)
 
(0.2
)
 
(7.9
)
 
(0.2
)

The estimated amounts of contributions expected to be paid to the plans during 2015 are $15.2 million for retirement plans and none for the medical plan. Payments made to the plans during the nine months ended September 30, 2015 were $3.8 million to the retirement plan and zero to the medical plan.