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Commitments (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of commitments and contingencies
A schedule of future minimum long-term purchase commitments, based on expected market prices as of December 31, 2018, and minimum lease payments under non-cancelable operating leases as of December 31, 2018 is as follows:
(in millions)
Purchase
Commitments
 
Operating
Leases
2019
$
2,586.5

 
$
97.5

2020
588.9

 
76.8

2021
495.7

 
54.7

2022
375.5

 
36.6

2023
261.1

 
28.1

Subsequent years
1,437.9

 
30.9

 
$
5,745.6

 
$
324.6