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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 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 June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.3

 
$
0.6

 
$
0.7

 
$
1.2

Interest cost
36.3

 
34.7

 
73.0

 
69.4

Expected return on assets
(50.7
)
 
(46.2
)
 
(101.4
)
 
(92.1
)
Amortization of prior service cost
1.1

 
0.9

 
2.1

 
1.8

Amortization of (gain) loss
0.6

 
6.5

 
0.1

 
13.3

Net periodic benefit cost (income)
$
(12.4
)
 
$
(3.5
)
 
$
(25.5
)
 
$
(6.4
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.0

 
$
1.2

 
$
2.0

 
$
2.4

Interest cost
5.1

 
5.2

 
10.1

 
10.5

Amortization of prior service cost (credit)
(18.3
)
 
(20.0
)
 
(36.6
)
 
(40.0
)
Amortization of (gain) loss
(0.4
)
 
0.6

 
(0.7
)
 
1.1

Net periodic benefit cost (income)
$
(12.6
)
 
$
(13.0
)
 
$
(25.2
)
 
$
(26.0
)