Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Summary of Acronyms Used

The acronyms that appear in these Notes to our Consolidated Financial Statements refer to the following:

ASC	Accounting Standards Codification
ASU	Accounting Standards Update
EITF	Emerging Issues Task Force
FASB	Financial Accounting Standards Board
SEC	Securities and Exchange Commission

Summary of Depreciation for Internally Developed Software

The table below summarizes our depreciation expense related to capitalized developed software for the past three years:

(in millions)	2019		2018		2017
Capitalized developed software depreciation expense	$	61.1	$	42.8	$	30.6

Summary of Capitalized Software Development Costs

The table below summarizes our capitalized software development costs for the past three years:

(in millions)	2019		2018		2017
Capitalized software development costs	$	64.8	$	53.5	$	46.3