Condensed Consolidated Statements of Changes in Temporary Equity and Equity - USD ($) $ in Millions	Total	Senior A Senior Preferred Shares	Redeemable non- controlling interest	Common stock	Additional paid-In capital ("APIC")	Retained earnings	Accumulated other comprehensive loss	Non- controlling interest ("NCI")
Beginning balance (in shares) at Dec. 31, 2021				110,618,049
Beginning balance at Dec. 31, 2021	$ 1,071.0			$ 227.5	$ 59.5	$ 839.6	$ (56.0)	$ 0.4
Increase (Decrease) in Equity
Net income	274.4					274.4
Other comprehensive income (loss)	(54.4)						(54.4)
Controlling interests	220.0					274.4	(54.4)
Stock option exercises (in shares)				155,694
Stock option exercises	5.8			$ 7.1	(1.3)
Issuance of common stock related to vesting of share units (in shares)				97,040
Issuance of common stock related to vesting of share units	(3.7)			$ 2.4	(6.1)
Share-based continuing employment costs related to business combinations	6.0			$ 2.1	3.9
Share-based payments expense	25.3				25.3
Equity-classified share units dividend equivalents	0.0				0.6	(0.6)
Dividends paid to common stockholders	(85.3)					(85.3)
Ending balance (in shares) at Sep. 30, 2022				110,870,783
Ending balance at Sep. 30, 2022	1,239.2			$ 239.1	81.9	1,028.1	(110.4)	0.4
Beginning balance (in shares) at Jun. 30, 2022				110,791,788
Beginning balance at Jun. 30, 2022	1,244.0			$ 235.2	73.0	1,015.3	(79.9)	0.4
Increase (Decrease) in Equity
Net income	42.9					42.9
Other comprehensive income (loss)	(30.5)						(30.5)
Controlling interests	12.4					42.9	(30.5)
Stock option exercises (in shares)				75,511
Stock option exercises	2.9			$ 3.5	(0.6)
Issuance of common stock related to vesting of share units (in shares)				3,484
Issuance of common stock related to vesting of share units	(0.1)			$ 0.1	(0.2)
Share-based continuing employment costs related to business combinations	1.8			$ 0.3	1.5
Share-based payments expense	8.0				8.0
Equity-classified share units dividend equivalents	0.0				0.2	(0.2)
Dividends paid to common stockholders	(29.9)					(29.9)
Ending balance (in shares) at Sep. 30, 2022				110,870,783
Ending balance at Sep. 30, 2022	$ 1,239.2			$ 239.1	81.9	1,028.1	(110.4)	0.4
Beginning balance (in shares) at Dec. 31, 2022	0	0
Beginning balance at Dec. 31, 2022		$ 0.0	$ 0.0
Increase (Decrease) in Temporary Equity
Net income			(0.4)
Total comprehensive income			(0.4)
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 Sep. 30, 2023	485,000,000	485,000,000
Ending balance at Sep. 30, 2023		$ 482.0	8.5
Beginning balance (in shares) at Dec. 31, 2022				110,881,363
Beginning balance at Dec. 31, 2022	$ 1,290.1			$ 246.3	85.3	1,043.2	(85.1)	0.5
Increase (Decrease) in Equity
Net income	122.2					122.2
Other comprehensive income (loss)	1.6						1.6
Controlling interests	123.8					122.2	1.6
Stock option exercises (in shares)				351,349
Stock option exercises	15.6			$ 19.4	(3.8)
Issuance of common stock related to vesting of share units (in shares)				426,254
Issuance of common stock related to vesting of share units	(17.7)			$ 15.9	(33.6)
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	2.3			$ 0.9	1.4
Replacement of share-based awards in business combination	13.1				13.1
Share-based payments expense	28.5				28.5
Equity-classified share units dividend equivalents	0.0				1.2	(1.2)
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	(5.4)					(5.4)
Cumulative 5.5% dividends on Series A Senior Preferred Shares	(17.6)					(17.6)
Dividends paid to common stockholders	(248.7)					(248.7)
Ending balance (in shares) at Sep. 30, 2023				182,249,852
Ending balance at Sep. 30, 2023	$ 4,914.1			$ 4,010.7	92.1	892.5	(83.5)	2.3
Beginning balance (in shares) at Jun. 30, 2023		485,000,000
Beginning balance at Jun. 30, 2023		$ 482.0	8.7
Increase (Decrease) in Temporary Equity
Net income			(0.2)
Total comprehensive income			(0.2)
Ending balance (in shares) at Sep. 30, 2023	485,000,000	485,000,000
Ending balance at Sep. 30, 2023		$ 482.0	$ 8.5
Beginning balance (in shares) at Jun. 30, 2023				181,983,976
Beginning balance at Jun. 30, 2023	$ 4,922.1			$ 3,995.1	89.7	887.1	(52.1)	2.3
Increase (Decrease) in Equity
Net income	63.4					63.4
Other comprehensive income (loss)	(31.4)						(31.4)
Controlling interests	32.0					63.4	(31.4)
Stock option exercises (in shares)				250,275
Stock option exercises	11.6			$ 14.5	(2.9)
Issuance of common stock related to vesting of share units (in shares)				15,601
Issuance of common stock related to vesting of share units	(0.5)			$ 0.8	(1.3)
Share-based continuing employment costs related to business combinations	0.7			$ 0.3	0.4
Share-based payments expense	5.9				5.9
Equity-classified share units dividend equivalents	0.0				0.3	(0.3)
Participating dividends on Series A Senior Preferred Shares	(1.8)					(1.8)
Cumulative 5.5% dividends on Series A Senior Preferred Shares	(6.7)					(6.7)
Dividends paid to common stockholders	(49.2)					(49.2)
Ending balance (in shares) at Sep. 30, 2023				182,249,852
Ending balance at Sep. 30, 2023	$ 4,914.1			$ 4,010.7	$ 92.1	$ 892.5	$ (83.5)	$ 2.3