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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits, Description [Abstract]  
Schedule of Defined Benefit Plans Disclosures Net periodic benefit cost (income) for pension and other postretirement benefits was as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.7

 
$
0.8

 
$
2.1

 
$
2.1

Interest cost
27.0

 
31.9

 
81.0

 
95.9

Expected return on assets
(37.5
)
 
(42.9
)
 
(112.6
)
 
(128.6
)
Amortization of prior service cost
1.1

 
1.5

 
3.4

 
4.1

Amortization of loss
2.7

 
8.0

 
8.1

 
22.0

Settlement loss
—

 
4.9

 
—

 
4.9

Net periodic benefit cost (income)
$
(6.0
)
 
$
4.2

 
$
(18.0
)
 
$
0.4

 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.2

 
$
1.2

 
$
3.5

 
$
3.6

Interest cost
4.4

 
5.0

 
13.1

 
14.9

Amortization of prior service cost (credit)
(14.7
)
 
(15.0
)
 
(44.0
)
 
(45.2
)
Amortization of (gain) loss
(1.1
)
 
(1.1
)
 
(3.2
)
 
(3.2
)
Net periodic benefit cost (income)
$
(10.2
)
 
$
(9.9
)
 
$
(30.6
)
 
$
(29.9
)