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Pension and Other Postretirement Benefits (Notes)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits, Description [Abstract]  
Pension and Other Postretirement Benefits Pension and Other Postretirement Benefits
 

Net periodic benefit (income) expense for pension and other postretirement benefits was as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.7

 
$
0.7

 
$
1.2

 
$
1.5

Interest cost
22.2

 
23.8

 
44.5

 
47.5

Expected return on assets
(28.0
)
 
(38.8
)
 
(56.0
)
 
(77.6
)
Amortization of prior service cost
0.8

 
0.9

 
1.5

 
1.9

Amortization of (gain) loss
(1.8
)
 
4.0

 
(3.5
)
 
7.9

Termination benefits—Ashland Works
—

 
—

 
9.7

 
—

Net periodic benefit (income) expense
$
(6.1
)
 
$
(9.4
)
 
$
(2.6
)
 
$
(18.8
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
0.8

 
$
1.2

 
$
1.7

 
$
2.3

Interest cost
4.1

 
3.9

 
8.2

 
7.8

Amortization of prior service cost (credit)
(3.3
)
 
(3.4
)
 
(6.6
)
 
(6.8
)
Amortization of (gain) loss
(0.9
)
 
(0.4
)
 
(1.8
)
 
(0.7
)
Termination benefits—Ashland Works
—

 
—

 
3.6

 
—

Net periodic benefit (income) expense
$
0.7

 
$
1.3

 
$
5.1

 
$
2.6



We are required to contribute $43.5 to the master pension trust during 2019, of which $19.5 was contributed through June 30, 2019 and another $8.7 was contributed in July 2019. Based on current actuarial assumptions, we estimate that our required
pension contributions will be approximately $50.0 in 2020 and $50.0 in 2021. Factors that affect our estimates of future funding projections include return on plan assets, actuarial data and assumptions relating to plan participants, the discount rate used to measure the pension obligations and changes to regulatory funding requirements.