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Pension and Postretirement Health and Life Benefits (Tables)
 6 Months Ended
Jun. 30, 2013
General Discussion of Pension and Other Postretirement Benefits [Abstract]  
Schedule of Net Benefit Costs
 
Defined Benefit Pension Plans
 
Postretirement Health and Life Benefit Plans
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Service costs
$
3.7

 
$
3.7

 
$
7.4

 
$
7.3

 
$
0.9

 
$
0.9

 
$
1.8

 
$
1.8

Interest costs
11.0

 
12.0

 
22.0

 
24.1

 
2.3

 
2.8

 
4.5

 
5.6

Expected returns on plan assets (gains)
(12.7
)
 
(13.0
)
 
(25.5
)
 
(26.0
)
 
(0.6
)
 
(0.7
)
 
(1.2
)
 
(1.4
)
Amortization of prior service costs
0.5

 
0.4

 
0.7

 
0.8

 
—

 
—

 
—

 
—

Amortization of actuarial (gains) losses, net
6.1

 
4.9

 
12.2

 
9.8

 
0.7

 
1.1

 
1.4

 
2.2

Curtailment (gains)
(0.7
)
 
—

 
(0.7
)
 
—

 
—

 
—

 
—

 
—

Net benefit costs
$
7.9

 
$
8.0

 
$
16.1

 
$
16.0

 
$
3.3

 
$
4.1

 
$
6.5

 
$
8.2