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Defined Benefit and Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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
(14.7
)
 
(14.1
)
 
—

 
—

Amortization of prior service cost
(0.1
)
 
(0.2
)
 
(0.3
)
 
—

Amortization of net loss (gain)
4.8

 
3.3

 
—

 
(0.1
)
Net periodic benefit
$
(1.8
)
 
$
(2.0
)
 
$
—

 
$
—
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 three months ended March 31, 2020
$
0.5

 
$
1.0