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Pension and Post-retirement Plans
 6 Months Ended
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]  
Pension and Post-retirement Plans
Pension and Post-retirement Plans.  The Company has defined benefit pension plans that cover substantially all non-bargaining unit and certain bargaining unit employees. The Company also has unfunded non-qualified plans that provide benefits in excess of the amounts permitted to be paid under the provisions of the tax law to participants in qualified plans. In 2007, the Company changed the traditional defined benefit pension plan formula for new non-bargaining unit employees hired after January 1, 2008 and replaced it with a cash balance defined benefit pension plan formula. Subsequently, effective January 1, 2012, the Company froze the benefits under its traditional defined benefit plans for non-bargaining unit employees hired before January 1, 2008 and replaced the benefit with the same cash balance defined benefit pension plan formula provided to those employees hired after January 1, 2008. Retirement benefits under the cash balance pension plan formula are based on a fixed percentage of employee eligible compensation, plus interest. The plan interest credit rate will vary from year-to-year based on the ten-year U.S. Treasury rate.

The assumptions related to discount rates, expected long-term rates of return on invested plan assets, salary increases, age, mortality and health care cost trend rates, along with other factors, are used in determining the assets, liabilities and expenses associated with pension benefits. Management reviews the assumptions annually with its independent actuaries, taking into consideration existing and future economic conditions and the Company’s intentions with respect to these plans. Management believes that its assumptions and estimates are reasonable. Different assumptions, however, could result in material changes to the assets, obligations and costs associated with benefit plans.

The components of net periodic benefit cost recorded for the three months ended June 30, 2015 and 2014 were as follows (in millions):
 
Pension Benefits
 
Post-retirement Benefits
 
2015
 
2014
 
2015
 
2014
Service cost
$
0.7

 
$
0.5

 
$
0.1

 
$
—

Interest cost
1.7

 
2.2

 
—

 
0.1

Expected return on plan assets
(2.8
)
 
(2.6
)
 
—

 
—

Amortization of prior service credit
(0.2
)
 
(0.2
)
 
—

 
—

Amortization of net loss
2.5

 
0.1

 
—

 
—

Net periodic benefit cost
$
1.9

 
$
—

 
$
0.1

 
$
0.1


The components of net periodic benefit cost recorded for the six months ended June 30, 2015 and 2014 were as follows (in millions):
 
Pension Benefits
 
Post-retirement Benefits
 
2015
 
2014
 
2015
 
2014
Service cost
$
1.5

 
$
1.2

 
$
0.1

 
$
0.1

Interest cost
4.0

 
4.1

 
0.2

 
0.2

Expected return on plan assets
(5.5
)
 
(5.3
)
 
—

 
—

Amortization of prior service credit
(0.4
)
 
(0.4
)
 
—

 
—

Amortization of net loss
3.5

 
2.0

 
0.1

 
0.1

Net periodic benefit cost
$
3.1

 
$
1.6

 
$
0.4

 
$
0.4