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Retirement Benefits
 3 Months Ended
Mar. 31, 2020
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
 
Three Months Ended
March 31,
 
2020
 
2019
Components of net periodic benefit cost:
 
 
 
Service cost
$
78.7

 
$
61.8

Interest cost
105.0

 
120.7

Expected return on plan assets
(221.2
)
 
(211.1
)
Amortization of prior service cost
1.1

 
1.5

Recognized actuarial loss
111.0

 
69.6

Net periodic benefit cost
$
74.6

 
$
42.5


 
Retiree Health Benefit Plans
 
Three Months Ended
March 31,
 
2020
 
2019
Components of net periodic benefit income:
 
 
 
Service cost
$
9.8

 
$
8.8

Interest cost
11.0

 
14.6

Expected return on plan assets
(37.4
)
 
(36.0
)
Amortization of prior service benefit
(14.9
)
 
(15.7
)
Recognized actuarial loss
0.8

 
0.5

Net periodic benefit income
$
(30.7
)
 
$
(27.8
)

We contributed approximately $15 million to satisfy minimum funding requirements to our defined benefit pension and retiree health benefit plans during the three months ended March 31, 2020. There was no additional discretionary funding during the three months ended March 31, 2020. In April 2020, we made a $200 million discretionary contribution to our defined benefit pension plans, and during the remainder of 2020, we expect to make contributions of approximately $15 million to our defined benefit pension and retiree health plans to satisfy minimum funding requirements.