Table:
0
A
B
C
D
1
Year Ended December 31,
2
2019
2018
2017
3
Balance at January 1
$107.7
$116.7
$107.6
4
Additions based on tax positions related to the current year
33.3
8.1
7.6
5
Additions and reductions for tax positions of prior years
37.5
0.3
—
6
Foreign currency
(1.6)
(8.1)
1.9
7
Reduction as a result of the lapse of statute of limitations
(1.3)
(2.6)
(0.4)
8
Reduction as a result of effective settlements
—
(6.7)
—
9
Balance at December 31
$175.6
$107.7
$116.7

Questions and formulas:
Question: What was the percentage change in the balance at December 31 between 2018 and 2019?
Formula: (B9-C9)/C9
Formula2: (B9-C9)/C9
Level: Calculation