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Retirement Plans
 6 Months Ended
Mar. 28, 2014
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
 
Six Months Ended
 
March 28,
2014
 
March 29,
2013
 
March 28,
2014
 
March 29,
2013
Service cost
$
1.2


$
1.2

 
$
2.5

 
$
2.4

Interest cost
5.0


4.5

 
9.9

 
9.1

Expected return on plan assets
(6.1
)

(7.3
)
 
(12.2
)
 
(14.7
)
Amortization of net actuarial loss
2.1


3.0

 
4.2

 
6.0

Amortization of prior service (credit) cost
(0.2
)

0.2

 
(0.3
)
 
0.3

Plan settlements
0.3

 
—

 
0.3

 
—

Net periodic benefit cost
$
2.3


$
1.6

 
$
4.4

 
$
3.1



The net periodic benefit credit for the Company's postretirement benefit pension plans for the three months ended March 28, 2014 and March 29, 2013 was $1.8 million and $1.5 million, respectively, and $3.6 million and $3.1 million for the six months ended March 28, 2014 and March 29, 2013, respectively. The components of the credit were not material.
During the six months ended March 29, 2013, 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.