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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits, Description [Abstract]  
Schedule of Defined Benefit Plans Disclosures
Net periodic benefit (income) expense for pension and other postretirement benefits was as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.7

 
$
0.9

 
$
1.9

 
$
2.4

Interest cost
22.1

 
23.7

 
66.6

 
71.2

Expected return on assets
(28.0
)
 
(38.8
)
 
(84.0
)
 
(116.4
)
Amortization of prior service cost
1.0

 
1.0

 
2.5

 
2.9

Amortization of (gain) loss
(1.8
)
 
3.9

 
(5.3
)
 
11.8

Termination benefits—Ashland Works
—

 
—

 
9.7

 
—

Net periodic benefit (income) expense
$
(6.0
)
 
$
(9.3
)
 
$
(8.6
)
 
$
(28.1
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
0.7

 
$
1.1

 
$
2.4

 
$
3.4

Interest cost
4.1

 
3.9

 
12.3

 
11.7

Amortization of prior service cost (credit)
(3.3
)
 
(3.4
)
 
(9.9
)
 
(10.2
)
Amortization of (gain) loss
(0.9
)
 
(0.3
)
 
(2.7
)
 
(1.0
)
Termination benefits—Ashland Works
—

 
—

 
3.6

 
—

Net periodic benefit (income) expense
$
0.6

 
$
1.3

 
$
5.7

 
$
3.9