Schedule I - SiteOne Landscape Supply, Inc.’s Condensed Financial Statements - Condensed Balance Sheets (Details) - USD ($) $ in Millions	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021	Dec. 29, 2019
Assets
Deferred tax asset (Note 3)	$ 3.7	$ 3.2
Total assets	2,533.9	2,116.1
Liabilities and Stockholders’ Equity
Total liabilities	1,231.0	1,058.4
Stockholders' Equity:
Common stock, par value $0.01; 1,000,000,000 shares authorized; 45,148,312 and 44,788,385 shares issued, and 44,916,291 and 44,767,474 shares outstanding at January 1, 2023 and January 2, 2022, respectively	0.5	0.4
Additional paid-in capital	577.1	562.3
Retained earnings	742.9	497.5
Accumulated other comprehensive income (loss)	7.7	(2.2)
Treasury stock, at cost, 232,021 and 20,911 shares at January 1, 2023 and January 2, 2022, respectively	(25.3)	(0.3)
Total stockholders’ equity	1,302.9	1,057.7	$ 795.0	$ 393.2
Total liabilities and stockholders’ equity	2,533.9	2,116.1
Parent Company
Assets
Investment in wholly-owned subsidiary	1,302.4	1,057.1
Deferred tax asset (Note 3)	0.5	0.6
Total assets	1,302.9	1,057.7
Liabilities and Stockholders’ Equity
Total liabilities	0.0	0.0
Stockholders' Equity:
Common stock, par value $0.01; 1,000,000,000 shares authorized; 45,148,312 and 44,788,385 shares issued, and 44,916,291 and 44,767,474 shares outstanding at January 1, 2023 and January 2, 2022, respectively	0.5	0.4
Additional paid-in capital	577.1	562.3
Retained earnings	742.9	497.5
Accumulated other comprehensive income (loss)	7.7	(2.2)
Treasury stock, at cost, 232,021 and 20,911 shares at January 1, 2023 and January 2, 2022, respectively	(25.3)	(0.3)
Total stockholders’ equity	1,302.9	1,057.7
Total liabilities and stockholders’ equity	$ 1,302.9	$ 1,057.7