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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2015
General Discussion of Pension and Other Postretirement Benefits [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,
 
2015
 
2014
 
2015
 
2014
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.5

 
$
0.5

 
$
1.6

 
$
1.2

Interest cost
32.5

 
36.6

 
97.5

 
109.6

Expected return on assets
(49.5
)
 
(50.7
)
 
(148.9
)
 
(152.1
)
Amortization of prior service cost
1.1

 
1.1

 
3.3

 
3.2

Amortization of loss
7.8

 
1.1

 
23.4

 
1.2

Settlement loss
—

 
0.2

 
—

 
0.2

Net periodic benefit cost (income)
$
(7.6
)
 
$
(11.2
)
 
$
(23.1
)
 
$
(36.7
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.8

 
$
1.1

 
$
5.4

 
$
3.1

Interest cost
5.7

 
5.2

 
16.9

 
15.3

Amortization of prior service cost (credit)
(16.2
)
 
(18.3
)
 
(48.5
)
 
(54.9
)
Amortization of (gain) loss
0.4

 
(0.3
)
 
1.2

 
(1.0
)
Net periodic benefit cost (income)
$
(8.3
)
 
$
(12.3
)
 
$
(25.0
)
 
$
(37.5
)