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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 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