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Redeemable Noncontrolling Interests Redeemable Noncontrolling Interests (Tables)
 12 Months Ended
Dec. 31, 2015
Noncontrolling Interest [Abstract]  
Schedule of Redeemable Noncontrolling Interests
At December 31, 2014, the book value of the redeemable noncontrolling interests was determined as follows:

In millions
 
Balance at December 31, 2013
$
11.3

Net Loss Attributable to Redeemable Noncontrolling Interests
(0.7
)
Other Comprehensive Income
0.3

Redemption of Noncontrolling Interest
(10.9
)
Balance at December 31, 2014
$
—