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Pension and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Pension Cost The components of net periodic pension cost were as follows (in millions):
 Three Months Ended September 30, 2019April 11 to September 30, 2019
Service cost (1)
$0.5  $1.0  
Interest cost (2)
7.7  13.9  
Expected return on plan assets (2)
(9.4) (17.6) 
Net periodic pension cost$(1.2) $(2.7) 
(1)Included in contract drilling and general and administrative expense in our condensed consolidated statements of operations.

(2)Included in other, net, in our condensed consolidated statements of operations.