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Retirement Benefits
 9 Months Ended
Sep. 30, 2013
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Retirement Benefits
Retirement Benefits
The components of net periodic benefit (credit) cost included in the consolidated statements of income for the three months ended September 30, 2013 and 2012 are as follows:
 
Pension Benefits
 
Other Benefits
 
2013
 
2012
 
2013
 
2012
Service cost
$
3.5

 
$
4.1

 
$
1.6

 
$
1.7

Interest cost
17.2

 
19.1

 
5.6

 
6.8

Expected return on assets
(33.2
)
 
(33.7
)
 
(5.5
)
 
(5.2
)
Recognized actuarial loss
6.1

 
7.6

 
2.8

 
3.5

Settlement loss
2.6

 
4.0

 
—

 
—

Amortization of prior service credit
(0.2
)
 
(0.2
)
 
(3.3
)
 
(3.3
)
Net periodic benefit (credit) cost
$
(4.0
)
 
$
0.9

 
$
1.2

 
$
3.5

The components of net periodic benefit (credit) cost included in the consolidated statements of income for the nine months ended September 30, 2013 and 2012 are as follows:
 
Pension Benefits
 
Other Benefits
 
2013
 
2012
 
2013
 
2012
Service cost
$
10.8

 
$
12.3

 
$
5.0

 
$
5.1

Interest cost
50.6

 
57.4

 
16.8

 
20.6

Expected return on assets
(99.8
)
 
(101.0
)
 
(16.5
)
 
(15.7
)
Recognized actuarial loss
23.2

 
22.8

 
8.4

 
10.6

Settlement loss
9.7

 
10.6

 
—

 
—

Amortization of prior service credit
(0.6
)
 
(0.6
)
 
(10.0
)
 
(10.0
)
Net periodic benefit (credit) cost
$
(6.1
)
 
$
1.5

 
$
3.7

 
$
10.6


For the year ending December 31, 2013, no material contributions are expected to be necessary to meet the Employee Retirement Income Security Act, or ERISA, required funding levels; however, we may elect to make discretionary contributions up to the maximum amount deductible for income tax purposes. Contributions of $34.8 and $30.9 were made to our retirement benefit plans during the nine months ended September 30, 2013 and 2012, respectively.