Condensed Consolidated Statements of Changes in Temporary Equity and Stockholders' Equity - USD ($) $ in Millions	Total	Senior A Senior Preferred Shares	Redeemable non- controlling interest	Cumulative 5.5% Dividends on Series A Senior Preferred Shares	Common stock	Additional paid-In capital ("APIC")	Retained earnings	Retained earnings Senior A Senior Preferred Shares	Retained earnings Cumulative 5.5% Dividends on Series A Senior Preferred Shares	Accumulated other comprehensive loss	Non- controlling interest ("NCI")
Beginning balance (in shares) at Dec. 31, 2022		0
Beginning balance at Dec. 31, 2022		$ 0.0	$ 0.0
Increase (Decrease) in Temporary Equity
Net loss			(0.1)
Total comprehensive (loss)			(0.1)
NCI acquired in business combination			8.9
Issuance of Series A Senior Preferred Shares and common stock, net of issuance costs (in shares)		485,000,000
Issuance of Series A Senior Preferred Shares and common stock, net of issuance costs		$ 482.0
Ending balance (in shares) at Mar. 31, 2023		485,000,000
Ending balance at Mar. 31, 2023		$ 482.0	8.8
Beginning balance (in shares) at Dec. 31, 2022					110,881,363
Beginning balance at Dec. 31, 2022	$ 1,290.2				$ 246.3	$ 85.3	$ 1,043.2			$ (85.1)	$ 0.5
Increase (Decrease) in Equity
Net income (loss)	(28.1)						(28.1)
Other comprehensive income (loss)	15.1									15.1
Controlling interests	(13.0)						(28.1)			15.1
Stock option exercises (in shares)					19,277
Stock option exercises	0.7				$ 0.8	(0.1)
Issuance of common stock related to vesting of share units (in shares)					296,905
Issuance of common stock related to vesting of share units	(12.4)				$ 8.9	(21.3)
Issuance of common stock related to business combination (in shares)					70,339,723
Issuance of common stock related to business combination	3,713.2				$ 3,713.2
Share-based continuing employment costs related to business combinations	0.8				$ 0.3	0.5
Replacement of share-based awards in business combination	13.1					13.1
Share-based payments expense	10.9					10.9
Equity-classified share units dividend equivalents	0.0					0.4	(0.4)
NCI acquired in business combination	1.8										1.8
Issuance of Series A Senior Preferred Shares and common stock, net of issuance costs (in shares)					251,163
Issuance of Series A Senior Preferred Shares and common stock, net of issuance costs	15.0				$ 15.0
Participating dividends on Series A Senior Preferred Shares		$ (1.8)		$ (4.3)				$ (1.8)	$ (4.3)
Dividends paid to common stockholders	(150.4)
Ending balance (in shares) at Mar. 31, 2023					181,788,431
Ending balance at Mar. 31, 2023	$ 4,863.8				$ 3,984.5	88.8	858.2			(70.0)	2.3
Beginning balance (in shares) at Dec. 31, 2023	485,000,000	485,000,000
Beginning balance at Dec. 31, 2023		$ 482.0	8.4
Ending balance (in shares) at Mar. 31, 2024	485,000,000	485,000,000
Ending balance at Mar. 31, 2024		$ 482.0	$ 8.4
Beginning balance (in shares) at Dec. 31, 2023					182,843,942
Beginning balance at Dec. 31, 2023	$ 5,019.0				$ 4,054.2	88.0	918.5			(44.0)	2.3
Increase (Decrease) in Equity
Net income (loss)	107.4						107.4
Other comprehensive income (loss)	(25.0)									(25.0)
Controlling interests	82.4						107.4			(25.0)
Stock option exercises (in shares)					510,710
Stock option exercises	22.1				$ 28.1	(6.0)
Issuance of common stock related to vesting of share units (in shares)					255,772
Issuance of common stock related to vesting of share units	(11.2)				$ 12.2	(23.4)
Share-based payments expense	14.1					14.1
Equity-classified share units dividend equivalents	0.0					0.4	(0.4)
Participating dividends on Series A Senior Preferred Shares		$ (1.8)		$ (6.7)				$ (1.8)	$ (6.7)
Dividends paid to common stockholders	(49.3)
Ending balance (in shares) at Mar. 31, 2024					183,610,424
Ending balance at Mar. 31, 2024	$ 5,068.6				$ 4,094.5	$ 73.1	$ 967.7			$ (69.0)	$ 2.3