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Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2019
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block] We present changes in amounts attributable to redeemable noncontrolling interests in the following table.
(in millions)
 
Redeemable noncontrolling interests as of December 31, 2018
$
—

Acquisition of redeemable noncontrolling interest (1)
8.4

Net income
0.1

Redeemable noncontrolling interests as of June 30, 2019
$
8.5

(1) Reflects our acquisition of redeemable noncontrolling interest related to our 2019 acquisition of Latitude.
(in millions)
 
Redeemable noncontrolling interests as of December 31, 2017
$
3.8

Acquisition of redeemable noncontrolling interest (2)
(3.8
)
Redeemable noncontrolling interests as of June 30, 2018
$
—

(2) Reflects our redemption of the final portion of redeemable noncontrolling interest related to our 2014 acquisition of Tenzing AB and includes $2.3 million representing the difference between the redemption value and the carrying value of the acquired interest.