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Pension and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2021
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs [Table Text Block] The components of net periodic pension and retiree medical cost were as follows (in millions):
SuccessorPredecessor
 Two Months Ended June 30, 2021One Month Ended April 30, 2021 Three Months Ended June 30, 2020
Service cost (1)
$— $— $.7 
Interest cost (2)
3.8 1.6 6.4 
Expected return on plan assets(2)
(6.2)(3.0)(9.5)
Net periodic pension and retiree medical cost (income)$(2.4)$(1.4)$(2.4)
SuccessorPredecessor
 Two Months Ended June 30, 2021Four Months Ended April 30, 2021Six Months Ended June 30, 2020
Service cost (1)
$— $— $1.3 
Interest cost (2)
3.8 6.6 12.9 
Expected return on plan assets(2)
(6.2)(12.1)(19.0)
Amortization of net loss (2)
— .1 — 
Net periodic pension and retiree medical cost (income)$(2.4)$(5.4)$(4.8)

(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.