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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 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 June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.7

 
$
0.6

 
$
1.4

 
$
1.3

Interest cost
27.0

 
32.0

 
54.0

 
64.0

Expected return on assets
(37.5
)
 
(42.8
)
 
(75.1
)
 
(85.7
)
Amortization of prior service cost
1.1

 
1.3

 
2.3

 
2.6

Amortization of loss
2.7

 
7.0

 
5.4

 
14.0

Net periodic benefit cost (income)
$
(6.0
)
 
$
(1.9
)
 
$
(12.0
)
 
$
(3.8
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.1

 
$
1.2

 
$
2.3

 
$
2.4

Interest cost
4.4

 
4.9

 
8.7

 
9.9

Amortization of prior service cost (credit)
(14.7
)
 
(15.1
)
 
(29.3
)
 
(30.2
)
Amortization of (gain) loss
(1.0
)
 
(1.0
)
 
(2.1
)
 
(2.1
)
Net periodic benefit cost (income)
$
(10.2
)
 
$
(10.0
)
 
$
(20.4
)
 
$
(20.0
)