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Employee Benefit Plans
 3 Months Ended
Mar. 31, 2012
Pension and Other Postretirement Benefit Expense [Abstract]  
Employee Benefit Plans
EMPLOYEE BENEFIT PLANS

Net pension and postretirement cost for the Company’s defined pension and postretirement benefit plans for the three months ended March 31, 2012 and 2011 are set forth below (in millions):
 
 
Three Months Ended March 31,
Pension benefits
 
2012
 
2011
Service cost
 
$
4.3

 
$
4.0

Interest cost
 
9.8

 
10.1

Expected return on plan assets
 
(8.9
)
 
(9.1
)
Amortization of net actuarial loss and prior service cost
 
2.6

 
1.7

Net annual pension cost
 
$
7.8

 
$
6.7

    
 
 
Three Months Ended March 31,
Postretirement benefits
 
2012
 
2011
Service cost
 
$
0.1

 
$
0.1

Interest cost
 
0.4

 
0.4

Amortization of prior service credit
 
(0.1
)
 
(0.1
)
Amortization of net actuarial loss
 
0.1

 
0.1

Net annual postretirement benefit cost
 
$
0.5

 
$
0.5



During the three months ended March 31, 2012, approximately $11.4 million of contributions had been made to the Company’s defined benefit pension plans. The Company currently estimates its minimum contributions for 2012 to its defined benefit pension plans will aggregate approximately $39.0 million.
During the three months ended March 31, 2012, the Company made approximately $0.5 million of contributions to its U.S.-based postretirement health care and life insurance benefit plans. The Company currently estimates that it will make approximately $1.9 million of contributions to its U.S.-based postretirement health care and life insurance benefit plans during 2012.