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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of Accumulated Other Comprehensive Income (Loss)
Components of AOCI consist of the following:
  
December 31
In millions
2017
2016
Cumulative translation adjustments
$
(221.4
)
$
(718.9
)
Change in market value of derivative financial instruments, net of tax
(22.0
)
(17.4
)
Accumulated other comprehensive loss
$
(243.4
)
$
(736.3
)