Table:
Gross Carrying Amount	Accumulated Amortization	Net

(in millions)

June 30, 2019

Finite-Lived Intangible Assets

Customer relationships	$1,597.6	$(498.7)	$1,098.9

Underlying rights and other	3.4	(1.5)	1.9

Total	1,601.0	(500.2)	1,100.8

Indefinite-Lived Intangible Assets

Certifications	3.5	—	3.5

Underlying rights and other	14.5	—	14.5

Total	1,619.0	(500.2)	1,118.8

June 30, 2018

Finite-Lived Intangible Assets

Customer relationships	$1,597.0	$(405.6)	$1,191.4

Underlying rights and other	2.7	(0.6)	2.1

Total	1,599.7	(406.2)	1,193.5

Indefinite-Lived Intangible Assets

Certifications	3.5	—	3.5

Underlying rights and other	15.1	—	15.1

Total	$1,618.3	$(406.2)	$1,212.1

I'd like to know the total number of rows and columns in the provided table. Present the final answer in a JSON format {"row_number": "m", "column_number": "n"} such as {"row_number": "2", "column_number": "3"}.

This table has 20 rows and 4 columns. Thus, the final answer is {"row_number": "20", "column_number": "4"}.