Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value (in USD per share)	$ 0	$ 0	$ 0
Options outstanding, intrinsic value	$ 27.5
Options exercisable, intrinsic value	27.5
Options exercised, intrinsic value	0.4	$ 1.1	$ 16.0
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	1.3	1.3	1.2
Unrecognized compensation expense for non-option awards	$ 0.7
Weighted average remaining vesting period	6 months
Share-based compensation vested in period, fair value	$ 1.1	1.6	1.3
Time-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	10.2	8.1	8.2
Unrecognized compensation expense for non-option awards	$ 15.1
Weighted average remaining vesting period	2 years 1 month 6 days
Share-based compensation vested in period, fair value	$ 12.4	16.2	18.0
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense	24.5	24.9	20.2
Unrecognized compensation expense for non-option awards	$ 25.3
Weighted average remaining vesting period	1 year
Share-based compensation vested in period, fair value	$ 36.3	$ 15.0	11.9
WillScot Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock compensation expense			$ 0.2
Weighted average remaining contractual term	3 years 2 months 12 days
Converted Mobile Mini Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual term	2 years 10 months 24 days

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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