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Supplemental Cash Flow Information (Tables)
12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Supplemental Disclosure of Cash Flow Information
  
Years ended December 31
In millions
2017
2016
2015
Cash paid for interest, net
$
107.2

$
143.4

$
76.9

Cash paid for income taxes, net
362.1

145.1

182.8