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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2013
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,
 
2013
 
2012
 
2013
 
2012
Pension Benefits
 
 
 
 
 
 
 
Service cost
$
0.6

 
$
0.8

 
$
1.2

 
$
1.6

Interest cost
34.7

 
40.0

 
69.4

 
80.1

Expected return on assets
(46.2
)
 
(47.3
)
 
(92.1
)
 
(93.6
)
Amortization of prior service cost
0.9

 
0.8

 
1.8

 
1.9

Amortization of (gain) loss
6.5

 
6.1

 
13.3

 
12.2

Net periodic benefit cost (income)
$
(3.5
)
 
$
0.4

 
$
(6.4
)
 
$
2.2

 
 
 
 
 
 
 
 
Other Postretirement Benefits
 
 
 
 
 
 
 
Service cost
$
1.2

 
$
1.1

 
$
2.4

 
$
2.2

Interest cost
5.2

 
7.9

 
10.5

 
15.8

Amortization of prior service cost (credit)
(20.0
)
 
(19.3
)
 
(40.0
)
 
(38.6
)
Amortization of (gain) loss
0.6

 
—

 
1.1

 
—

Net periodic benefit cost (income)
$
(13.0
)
 
$
(10.3
)
 
$
(26.0
)
 
$
(20.6
)