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Retirement Benefits
 3 Months Ended
Mar. 31, 2017
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]  
Retirement Benefits
Retirement Benefits
 
 
 
 
 
 
 
 
The components of net periodic benefit credit included in the consolidated statements of income for the three months ended March 31, 2017 and 2016 are as follows:
 
Pension Benefits
 
Other Benefits
 
Three Months Ended 
 March 31
 
Three Months Ended 
 March 31
 
2017
 
2016
 
2017
 
2016
Service cost
$
2.5

 
$
2.8

 
$
0.3

 
$
0.4

Interest cost
16.6

 
17.3

 
5.2

 
5.6

Expected return on assets
(36.8
)
 
(36.7
)
 
(5.7
)
 
(5.6
)
Recognized actuarial loss
5.4

 
4.4

 
2.9

 
3.1

Settlement loss
1.7

 
2.4

 
—

 
—

Amortization of prior service credit
(0.1
)
 
(0.1
)
 
(3.4
)
 
(3.5
)
Net periodic benefit credit
$
(10.7
)
 
$
(9.9
)
 
$
(0.7
)
 
$
—


For the year ending December 31, 2017, 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. No contributions were made to our retirement benefit plans during the three months ended March 31, 2017 and 2016.