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Pension and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2012
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 September 30,
 
Nine Months Ended September 30,
 
2012
 
2011
 
2012
 
2011
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.8

 
$
0.8

 
$
2.4

 
$
2.4

Interest cost
40.1

 
45.1

 
120.2

 
135.5

Expected return on assets
(47.4
)
 
(51.7
)
 
(141.0
)
 
(155.6
)
Amortization of prior service cost
1.1

 
1.2

 
3.0

 
3.2

Amortization of (gain) loss
6.1

 
4.7

 
18.3

 
14.1

Net periodic benefit cost (income)
$
0.7

 
$
0.1

 
$
2.9

 
$
(0.4
)
 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.2

 
$
1.1

 
$
3.4

 
$
3.2

Interest cost
7.9

 
9.4

 
23.7

 
28.6

Settlement gain related to Middletown Retiree Settlement
—

 
—

 
—

 
(14.0
)
Amortization of prior service cost (credit)
(19.4
)
 
(19.2
)
 
(58.0
)
 
(57.5
)
Reversal of prior amortization related to Butler Retiree Settlement
—

 
—

 
—

 
14.2

Amortization of (gain) loss
—

 
(0.3
)
 
—

 
(0.8
)
Net periodic benefit cost (income)
$
(10.3
)
 
$
(9.0
)
 
$
(30.9
)
 
$
(26.3
)