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Pension and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
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 were as follows:
 
Three Months Ended March 31,
 
2014
 
2013
Pension Benefits
 
 
 
Service cost
$
0.4

 
$
0.6

Interest cost
36.7

 
34.7

Expected return on assets
(50.7
)
 
(45.9
)
Amortization of prior service cost
1.0

 
0.9

Amortization of (gain) loss
(0.5
)
 
6.8

Net periodic benefit cost (income)
$
(13.1
)
 
$
(2.9
)
 
 
 
 
Other Postretirement Benefits
 
 
 
Service cost
$
1.0

 
$
1.2

Interest cost
5.0

 
5.3

Amortization of prior service cost (credit)
(18.3
)
 
(20.0
)
Amortization of (gain) loss
(0.3
)
 
0.5

Net periodic benefit cost (income)
$
(12.6
)
 
$
(13.0
)