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Retirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Net periodic benefit cost for the Company's retirement benefit plans The following table sets forth the net periodic benefit cost for the Company’s defined benefit pension plans. The amounts for the three and nine months ended September 30, 2017 are based on calculations prepared by the Company's actuaries and represent the Company’s best estimate of each period’s proportionate share of the amounts to be recorded for the year ending December 31, 2017.
 
U.S. Plans
International Plans
Total
 
Three Months Ended
September 30,
Three Months Ended
September 30,
Three Months Ended
September 30,
 
2017
2016
2017
2016
2017
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
Service cost
$
3.1

$
3.3

$
0.4

$
0.4

$
3.5

$
3.7

Interest cost
6.2

6.6

1.9

2.6

8.1

9.2

Expected return on plan assets
(7.0
)
(7.4
)
(2.9
)
(2.6
)
(9.9
)
(10.0
)
Amortization of prior service cost
0.3

0.4

0.1

0.1

0.4

0.5

Net periodic benefit cost
$
2.6

$
2.9

$
(0.5
)
$
0.5

$
2.1

$
3.4


 
U.S. Plans
International Plans
Total
 
Nine Months Ended
September 30,
Nine Months Ended
September 30,
Nine Months Ended
September 30,
 
2017
2016
2017
2016
2017
2016
Components of net periodic benefit cost:
 
 
 
 
 
 
Service cost
$
9.2

$
9.9

$
1.2

$
1.1

$
10.4

$
11.0

Interest cost
18.5

20.0

5.6

8.2

24.1

28.2

Expected return on plan assets
(21.0
)
(22.3
)
(8.3
)
(8.0
)
(29.3
)
(30.3
)
Amortization of prior service cost
1.0

1.2

0.1

0.1

1.1

1.3

Recognition of actuarial loss
4.4

—

—

—

4.4

—

Net periodic benefit cost
$
12.1

$
8.8

$
(1.4
)
$
1.4

$
10.7

$
10.2