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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.7

 
$
0.7

 
$
1.5

 
$
1.4

Interest cost
23.8

 
27.0

 
47.5

 
54.0

Expected return on assets
(38.8
)
 
(37.5
)
 
(77.6
)
 
(75.1
)
Amortization of prior service cost
0.9

 
1.1

 
1.9

 
2.3

Amortization of loss
4.0

 
2.7

 
7.9

 
5.4

Net periodic benefit (income) expense
$
(9.4
)
 
$
(6.0
)
 
$
(18.8
)
 
$
(12.0
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.2

 
$
1.1

 
$
2.3

 
$
2.3

Interest cost
3.9

 
4.4

 
7.8

 
8.7

Amortization of prior service cost (credit)
(3.4
)
 
(14.7
)
 
(6.8
)
 
(29.3
)
Amortization of (gain) loss
(0.4
)
 
(1.0
)
 
(0.7
)
 
(2.1
)
Net periodic benefit (income) expense
$
1.3

 
$
(10.2
)
 
$
2.6

 
$
(20.4
)