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Commitments And Contingencies (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Capital Commitments
The following table summarizes the cumulative amount of contractual payments made as of December 31, 2016 for our rigs under construction and estimated timing of our remaining contractual payments (in millions): 
 
 
Cumulative Paid(1)
 
2017
 
2018
 
2019
 
Total(2)
ENSCO DS-10 (3)
 
$
245.4

 
$
234.0

 
$
—

 
$
75.0

 
$
554.4

ENSCO 123
 
57.5

 
8.0

 
215.3

 
—

 
280.8

 
 
$
302.9

 
$
242.0

 
$
215.3

 
$
75.0

 
$
835.2



(1)
Cumulative paid represents the aggregate amount of contractual payments made from commencement of the construction agreement through December 31, 2016.

(2)
Total commitments are based on fixed-price shipyard construction contracts, exclusive of costs associated with commissioning, systems integration testing, project management and capitalized interest.

(3) 
In January 2017, we reached an agreement with the shipyard constructing ENSCO DS-10 to further delay delivery and $75.0 million of the final milestone payment until the first quarter of 2019, or such earlier date as we may elect to take delivery.