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Retirement Plans
 3 Months Ended
Dec. 27, 2013
Compensation and Retirement Disclosure [Abstract]  
Retirement Plans
12.
Retirement Plans
The net periodic benefit cost for the Company's defined benefit pension plans was as follows:
 
Three Months Ended
 
December 27,
2013
 
December 28,
2012
Service cost
$
1.3


$
1.2

Interest cost
4.9


4.6

Expected return on plan assets
(6.1
)

(7.4
)
Amortization of net actuarial loss
2.1


3.0

Amortization of prior service (credit) cost
(0.1
)

0.1

Net periodic benefit cost
$
2.1


$
1.5



The net periodic benefit credit for postretirement benefit plans for the three months ended December 27, 2013 and December 28, 2012 was $1.8 million and $1.6 million, respectively. The components of the credit were not material.
During the three months ended December 28, 2012, Covidien made a $37.5 million voluntary contribution to the Company's pension plans. The Company may elect to make voluntary contributions to its defined benefit pension plans or its postretirement benefit plans during fiscal 2014.