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Redeemable Noncontrolling Interest (Tables)
 12 Months Ended
Dec. 31, 2018
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest
At December 31, 2018, the redeemable noncontrolling interest was determined as follows:
In millions
 
Balance at December 31, 2017
$
—

Issuance of Redeemable Noncontrolling Interest at January 1, 2018
255.2

Reclassification to Redeemable Noncontrolling Interest for Share Repurchases
12.5

Net Income Attributable to Redeemable Noncontrolling Interest
16.6

Other Comprehensive Loss, Net of Tax
(2.8
)
Distributions of Membership Interest
(5.7
)
Balance at December 31, 2018
$
275.8