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EMPLOYEE BENEFIT PLANS
 6 Months Ended
Jun. 30, 2011
Compensation and Retirement Disclosure [Abstract]  
EMPLOYEE BENEFIT PLANS
EMPLOYEE BENEFIT PLANS
 
Pension Plans - Qualified Defined Benefit


Net pension expense for the three and six months ended June 30, 2011 and 2010 included the following components (in millions):
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2011
 
2010
 
2011
 
2010
Service cost
$
9.0


 
$
8.1


 
$
18.0


 
$
16.2


Interest cost
18.3


 
16.9


 
36.6


 
33.8


Expected return on assets
(22.1
)
 
(17.7
)
 
(44.2
)
 
(35.4
)
Amortization of prior service cost
(0.2
)
 
(0.2
)
 
(0.4
)
 
(0.4
)
Actuarial loss
6.1


 
5.5


 
12.2


 
11.0


Net pension expense
$
11.1


 
$
12.6


 
$
22.2


 
$
25.2




The Company contributed $11.1 million and $22.2 million to its qualified defined-benefit plans during the three and six months ended June 30, 2011, respectively. There is no minimum required contribution in 2011, although the Company expects to contribute an additional $11.1 million to these plans during the remainder of 2011. The Company contributed $15.2 million and $30.4 million to its qualified defined-benefit pension plans during the three and six months ended June 30, 2010, respectively.


On June 20, 2011, the Board of Directors authorized the Company to amend its defined-benefit pension plans for salaried employees such that participants' benefits will freeze effective January 1, 2014. Active participants in the defined-benefit plan will receive a higher Company contribution to the defined-contribution plan beginning on the same date. The Company will remeasure the projected benefit obligation and will record any curtailment gain or loss from the amendments when executed. Management does not expect the gain or loss to be material to the financial statements.


Pension Plans - Nonqualified Defined Benefit


Net pension expense for the unfunded, noncontributory defined-benefit plans was $0.9 million and $0.8 million for the three months ended June 30, 2011 and 2010 was $1.8 million and $1.6 million for the six months ended June 30, 2011 and 2010. Similar to the amendment to the qualified plan, the Board of Directors amended the nonqualified defined-benefit plan such that participants' benefits will be frozen effective January 1, 2014.


Post-retirement Medical Benefits


Net periodic benefit cost for the post-retirement medical plans for the three months ended June 30, 2011 and 2010 was $3.7 million and $3.1 million, respectively. The net periodic benefit cost for the six months ended June 30, 2011 and 2010 was $7.4 million and $6.2 million, respectively.