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Defined Benefit and Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures
 
Pension
 
Postretirement
(in millions)
2020
 
2019
 
2020
 
2019
Service cost
$
1.6

 
$
1.3

 
$
0.1

 
$
—

Interest cost
6.6

 
7.7

 
0.2

 
0.1

Expected return on plan assets
(14.0
)
 
(14.2
)
 
—

 
—

Amortization of prior service cost
(0.1
)
 
(0.2
)
 
—

 


Amortization of net loss (gain)
4.9

 
3.3

 
(0.3
)
 
(0.1
)
Net periodic benefit
$
(1.0
)
 
$
(2.1
)
 
$
—

 
$
—
Schedule of Contributions By Benefit Plan Type We now expect to contribute the following to our pension and postretirement plans:
(in millions)
Pension
 
Postretirement
Expected contributions in 2020
$
3.2

 
$
2.5

Amounts contributed during the six months ended June 30, 2020
$
1.1

 
$
1.2