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Noncontrolling Interest (Tables)
 12 Months Ended
Dec. 31, 2015
Noncontrolling Interest [Abstract]  
Schedule of Redeemable Noncontrolling Interest
The following table is a roll-forward of the redeemable noncontrolling interest from December 31, 2014 to December 31, 2015:
(Dollars in millions)
 
As of December 31, 2014
$
—

ND acquisition noncontrolling interest
784.2

Comprehensive gain attributable to redeemable noncontrolling interest
0.8

Adjustment to record noncontrolling interest at redemption value
(4.9
)
Adjustments for shares purchased, net of currency adjustment
(459.7
)
Transfer to noncontrolling interest within permanent equity
(320.4
)
As of December 31, 2015
$
—