Stockholders' Equity - Narrative (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Performance-based Restricted Stock Units
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued in connection with Mattress Firm Acquisition (in shares)		1.4	0.3	2.1
Value of treasury stock acquired	$ 0.0	$ 94.9	$ 26.2	$ 132.4
Restricted Stock Units (RSUs)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Shares issued in connection with Mattress Firm Acquisition (in shares)		1.4	0.3	2.1
February 2016 Program
Accumulated Other Comprehensive Income (Loss) [Line Items]
Remaining shares under share repurchase authorization	$ 774.5		$ 774.5