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Defined Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Retirement Benefits [Abstract]  
Schedule of defined benefit plans The table below provides summary information on the defined benefit plans:
 
December 31,
 
2018
 
2017
 
2016
 
in millions
 
 
 
 
 
 
Fair value of plan assets (a)
$
1,305.0

 
$
1,412.2

 
$
1,198.7

Projected benefit obligation
$
1,217.5

 
$
1,335.4

 
$
1,205.1

Net asset (liability)
$
87.5

 
$
76.8

 
$
(6.4
)
_______________ 

(a)
The fair value of plan assets at December 31, 2018 includes $918.3 million, $137.6 million and $249.1 million of assets that are valued based on Level 1, Level 2 and Level 3 inputs, respectively, of the fair value hierarchy (as further described in note 9). Our plan assets comprise investments in debt securities, equity securities, hedge funds, insurance contracts and certain other assets.