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Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2019
Noncontrolling Interest [Abstract]  
Reconciliation Of Income From Continuing Operations [Table Text Block]
Loss from continuing operations attributable to Valaris for the three-month and six-month periods ended June 30, 2019 and 2018 was as follows (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2019
 
2018
 
2019
 
2018
Income (loss) from continuing operations
$
407.3

 
$
(142.1
)
 
$
219.3

 
$
(282.5
)
Income from continuing operations attributable to noncontrolling interests
(1.8
)
 
(.9
)
 
(4.2
)
 
(0.5
)
Income (loss) from continuing operations attributable to Valaris
$
405.5

 
$
(143.0
)
 
$
215.1

 
$
(283.0
)