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Pension and Postretirement Health and Life Benefits (Tables)
 3 Months Ended
Mar. 31, 2014
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 
 March 31,
 
Three Months Ended 
 March 31,
 
2014
 
2013
 
2014
 
2013
Service costs
$
0.6

 
$
3.7

 
$
0.5

 
$
0.9

Interest costs
10.5

 
11.0

 
2.5

 
2.2

Expected returns on plan assets (gains)
(12.8
)
 
(12.8
)
 
(0.5
)
 
(0.6
)
Amortization of actuarial (gains) losses, net
0.3

 
6.1

 
—

 
0.7

Amortization of prior service costs (credits)
—

 
0.2

 
(0.1
)
 
—

Net benefit costs (credit)
$
(1.4
)
 
$
8.2

 
$
2.4

 
$
3.2