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Supplemental Cash Flow Information
12 Months Ended
Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information
  
Years ended December 31
In millions
2016
2015
2014
Cash paid for interest, net
$
143.4

$
76.9

$
67.5

Cash paid for income taxes, net
145.1

182.8

134.2