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Employee Benefits
 6 Months Ended
Jun. 30, 2015
Compensation And Retirement Disclosure [Abstract]  
Employee Benefits

7. Employee Benefits

The components of the estimated net pension and other postretirement benefits plan income for the three and six months ended June 30, 2015 and 2014 were as follows:

 

 

 

Three Months Ended

 

 

Six Months Ended

 

 

 

June 30,

 

 

June 30,

 

 

 

2015

 

 

2014

 

 

2015

 

 

2014

 

Pension (income) expense

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

0.5

 

 

$

0.6

 

 

$

1.1

 

 

$

1.1

 

Interest cost

 

 

44.6

 

 

 

48.9

 

 

 

89.4

 

 

 

96.6

 

Expected return on plan assets

 

 

(61.7

)

 

 

(66.1

)

 

 

(123.3

)

 

 

(129.2

)

Amortization, net

 

 

10.2

 

 

 

8.5

 

 

 

20.4

 

 

 

16.3

 

Net pension income

 

$

(6.4

)

 

$

(8.1

)

 

$

(12.4

)

 

$

(15.2

)

Other postretirement benefits plan (income) expense

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Service cost

 

$

1.2

 

 

$

1.2

 

 

$

2.4

 

 

$

2.3

 

Interest cost

 

 

4.0

 

 

 

4.2

 

 

 

8.0

 

 

 

8.4

 

Expected return on plan assets

 

 

(3.2

)

 

 

(3.1

)

 

 

(6.5

)

 

 

(6.2

)

Amortization, net

 

 

(6.8

)

 

 

(6.5

)

 

 

(13.5

)

 

 

(12.9

)

Net other postretirement benefits plan income

 

$

(4.8

)

 

$

(4.2

)

 

$

(9.6

)

 

$

(8.4

)