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Employee Benefits
 9 Months Ended
Sep. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Employee Benefits
Employee Benefits
 
The Company has a funded qualified defined benefit pension plan and an unfunded supplemental defined benefit pension plan. The Company also has unfunded postretirement benefit plans that provide certain health care and life insurance benefits for certain retired employees. During the nine months ended September 30, 2012, the Company made contributions of $4.9 million to its funded pension plan, and $1.0 million to its unfunded pension plan. Contributions to funded plans increase plan assets while contributions to unfunded plans are used to fund current benefit payments. During the remainder of 2012, the Company expects to contribute approximately $0.7 million to its funded pension plans, and approximately $0.3 million to its unfunded pension plans. In July 2012, Congress passed the Moving Ahead for Progress in the 21st Century Act, which included pension funding stabilization provisions. The measure, which is designed to stabilize the discount rate used to determine funding requirements from the effects of interest rate volatility, may reduce the Company’s United States Pension Plan contributions during the remainder of 2012 from the planned amounts.

The following table sets forth the Company’s pension and postretirement benefits net period benefit costs:
 
 
Pension
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
 
(in millions)
Service cost
$
1.1

 
$
0.7

 
$
3.0

 
$
2.1

Interest cost
1.3

 
1.2

 
3.7

 
3.4

Expected return on plan assets
(0.9
)
 
(0.7
)
 
(2.7
)
 
(1.9
)
Amortization of prior service costs
1.3

 
1.4

 
3.9

 
4.0

Amortization of actuarial loss
0.6

 
—

 
1.0

 
—

Periodic expense
$
3.4

 
$
2.6

 
$
8.9

 
$
7.6

 
 
Postretirement benefits
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2012
 
2011
 
2012
 
2011
 
(in millions)
Service cost
$
0.1

 
$
0.1

 
$
0.1

 
$
0.1

Interest cost
—

 
—

 
0.2

 
0.2

Expected return on plan assets
—

 
—

 
—

 
—

Amortization of prior service costs
0.1

 
0.1

 
0.3

 
0.3

Recognized net actuarial loss
—

 
—

 
—

 
—

Periodic expense
$
0.2

 
$
0.2

 
$
0.6

 
$
0.6