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Fair Value Measurement and Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Estimated Fair Values and Related Carrying Values of Financial Instruments
The estimated fair values and related carrying values of the Company’s financial instruments are as follows:
 
September 30, 2019
 
December 31, 2018
In millions
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
4.375% Senior Notes due 2023
$
249.0

 
$
262.4

 
$
248.8

 
$
254.2

3.45% Senior Notes due 2026
$
748.5

 
$
758.3

 
$
748.2

 
$
675.1

Floating Rate Notes due 2021
$
497.7

 
$
500.0

 
$
496.8

 
$
497.4

4.15% Senior Notes due 2024
$
744.0

 
$
799.3

 
$
743.0

 
$
729.4

4.7% Senior Notes due 2028
$
1,240.5

 
$
1,378.4

 
$
1,239.7

 
$
1,179.6