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Pension and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2016
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 March 31,
 
2016
 
2015
Pension Benefits
 
 
 
Service cost
$
0.7

 
$
0.6

Interest cost
32.0

 
32.5

Expected return on assets
(42.9
)
 
(49.7
)
Amortization of prior service cost
1.3

 
1.1

Amortization of loss
7.0

 
7.8

Net periodic benefit cost (income)
$
(1.9
)
 
$
(7.7
)
 
 
 
 
Other Postretirement Benefits
 
 
 
Service cost
$
1.2

 
$
1.8

Interest cost
5.0

 
5.6

Amortization of prior service cost (credit)
(15.1
)
 
(16.2
)
Amortization of (gain) loss
(1.1
)
 
0.4

Net periodic benefit cost (income)
$
(10.0
)
 
$
(8.4
)