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Retirement and Postretirement Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2013
Compensation and Retirement Disclosure [Abstract]  
Net periodic benefit cost for the Company's retirement benefit plans
 
Pension
 
Postretirement
 
Three Months Ended
June 30,
 
Three Months Ended
June 30,
 
2013
2012
 
2013
2012
Components of net periodic benefit cost:
 
 
 
 
 
Service cost
$
9.2

$
8.4

 
$
0.7

$
0.5

Interest cost
33.3

37.8

 
5.1

6.7

Expected return on plan assets
(58.9
)
(55.3
)
 
(3.0
)
(2.5
)
Amortization of prior service cost
1.1

2.4

 
—

—

Amortization of net actuarial loss
29.1

20.5

 
(0.5
)
0.2

Pension curtailments and settlements
5.2

10.7

 
—

—

Net periodic benefit cost
$
19.0

$
24.5

 
$
2.3

$
4.9

 
Pension
 
Postretirement
 
Six Months Ended
June 30,
 
Six Months Ended
June 30,
 
2013
2012
 
2013
2012
Components of net periodic benefit cost:
 
 
 
 
 
Service cost
$
19.3

$
17.2

 
$
1.5

$
1.2

Interest cost
67.3

75.6

 
10.8

13.9

Expected return on plan assets
(116.2
)
(110.5
)
 
(5.8
)
(5.3
)
Amortization of prior service cost (credit)
2.3

4.7

 
(0.1
)
(0.1
)
Amortization of net actuarial loss
58.3

41.7

 
1.2

1.3

Pension curtailments and settlements
5.2

10.7

 
—

—

Net periodic benefit cost
$
36.2

$
39.4

 
$
7.6

$
11.0