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Retirement Benefits
 6 Months Ended
Jun. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Retirement Benefits Retirement Benefits
Net pension and retiree health benefit (income) cost included the following components:
 
Defined Benefit Pension Plans
 
Defined Benefit Pension Plans
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit cost:
 
 
 
 
 
 
 
Service cost
$
63.5

 
$
74.9

 
$
125.4

 
$
152.5

Interest cost
122.6

 
111.4

 
243.3

 
223.3

Expected return on plan assets
(210.1
)
 
(210.0
)
 
(421.2
)
 
(420.9
)
Amortization of prior service cost
1.5

 
1.3

 
3.0

 
2.4

Recognized actuarial loss
73.1

 
91.1

 
142.7

 
181.1

Net periodic benefit cost
$
50.6

 
$
68.7

 
$
93.2

 
$
138.4


 
Retiree Health Benefit Plans
 
Retiree Health Benefit Plans
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Components of net periodic benefit income:
 
 
 
 
 
 
 
Service cost
$
9.4

 
$
10.9

 
$
18.2

 
$
21.6

Interest cost
14.4

 
13.5

 
29.0

 
27.4

Expected return on plan assets
(36.0
)
 
(43.9
)
 
(71.9
)
 
(87.8
)
Amortization of prior service benefit
(15.7
)
 
(20.4
)
 
(31.5
)
 
(40.9
)
Recognized actuarial loss
0.4

 
2.2

 
0.9

 
4.6

Net periodic benefit income
$
(27.5
)
 
$
(37.7
)
 
$
(55.3
)
 
$
(75.1
)

We contributed approximately $20 million required to satisfy minimum funding requirements to our defined benefit pension and retiree health benefit plans during the six months ended June 30, 2019. During the remainder of 2019, we expect to make contributions to our defined benefit pension and retiree health benefit plans of approximately $30 million to satisfy minimum funding requirements. There was no discretionary funding during the six months ended June 30, 2019, and none is planned for the remainder of 2019.