Unaudited Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Millions	Total	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Class A common stock	Class A common stock Common Stock	Class C common stock	Class C common stock Common Stock
Beginning balance (in shares) at Dec. 31, 2022						79,086,372		2,921,099
Beginning balance at Dec. 31, 2022	$ 612.8	$ 704.3	$ (96.7)	$ 5.2		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based awards vested and distributed (in shares)						368,153
Stock Issued During Period, Value, New Issues	(0.4)	(0.4)
Issue Director shares (in shares)						14,084
APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	2.8	2.8
Net income (loss)	(12.4)		(12.4)
Other comprehensive income (loss)	0.8			0.8
Ending balance (in shares) at Mar. 31, 2023						79,468,609		2,921,099
Ending balance at Mar. 31, 2023	603.6	706.7	(109.1)	6.0		$ 0.0		$ 0.0
Beginning balance (in shares) at Dec. 31, 2022						79,086,372		2,921,099
Beginning balance at Dec. 31, 2022	612.8	704.3	(96.7)	5.2		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(17.8)
Other comprehensive income (loss)	(5.2)
Ending balance (in shares) at Sep. 30, 2023						79,652,315		2,921,099
Ending balance at Sep. 30, 2023	577.6	692.1	(114.5)	0.0		$ 0.0		$ 0.0
Beginning balance (in shares) at Mar. 31, 2023						79,468,609		2,921,099
Beginning balance at Mar. 31, 2023	603.6	706.7	(109.1)	6.0		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based awards vested and distributed (in shares)						27,931
Issue Director shares (in shares)						51,240
APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	(9.5)	(9.5)
Net income (loss)	(2.1)		(2.1)
Other comprehensive income (loss)	(1.8)			(1.8)
Ending balance (in shares) at Jun. 30, 2023						79,547,780		2,921,099
Ending balance at Jun. 30, 2023	590.2	697.2	(111.2)	4.2		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based awards vested and distributed (in shares)						65,830
Issue Director shares (in shares)						38,705
APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	(5.1)	(5.1)
Net income (loss)	(3.3)		(3.3)
Other comprehensive income (loss)	(4.2)			(4.2)
Ending balance (in shares) at Sep. 30, 2023						79,652,315		2,921,099
Ending balance at Sep. 30, 2023	577.6	692.1	(114.5)	0.0		$ 0.0		$ 0.0
Beginning balance (in shares) at Dec. 31, 2023					79,684,170	79,684,170	2,921,099	2,921,099
Beginning balance at Dec. 31, 2023	572.0	693.7	(123.8)	2.1		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based awards vested and distributed (in shares)						353,622
Stock Issued During Period, Value, New Issues	(0.4)	(0.4)
Issue Director shares (in shares)						16,110
APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1.3	1.3
Net income (loss)	(8.1)		(8.1)
Other comprehensive income (loss)	(4.8)			(4.8)
Ending balance (in shares) at Mar. 31, 2024						80,053,902		2,921,099
Ending balance at Mar. 31, 2024	560.0	694.6	(131.9)	(2.7)		$ 0.0		$ 0.0
Beginning balance (in shares) at Dec. 31, 2023					79,684,170	79,684,170	2,921,099	2,921,099
Beginning balance at Dec. 31, 2023	572.0	693.7	(123.8)	2.1		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(10.7)
Other comprehensive income (loss)	(1.2)
Ending balance (in shares) at Sep. 30, 2024					80,309,764	80,309,764	2,921,099	2,921,099
Ending balance at Sep. 30, 2024	564.3	697.9	(134.5)	0.9		$ 0.0		$ 0.0
Beginning balance (in shares) at Mar. 31, 2024						80,053,902		2,921,099
Beginning balance at Mar. 31, 2024	560.0	694.6	(131.9)	(2.7)		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based awards vested and distributed (in shares)						7,500
Issue Director shares (in shares)						228,510
APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1.5	1.5
Net income (loss)	5.5		5.5
Other comprehensive income (loss)	(0.8)			(0.8)
Ending balance (in shares) at Jun. 30, 2024						80,289,912		2,921,099
Ending balance at Jun. 30, 2024	566.2	696.1	(126.4)	(3.5)		$ 0.0		$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based awards vested and distributed (in shares)						7,500
Issue Director shares (in shares)						12,352
APIC, Share-Based Payment Arrangement, Restricted Stock Unit, Increase for Cost Recognition	1.8	1.8
Net income (loss)	(8.1)		(8.1)
Other comprehensive income (loss)	4.4			4.4
Ending balance (in shares) at Sep. 30, 2024					80,309,764	80,309,764	2,921,099	2,921,099
Ending balance at Sep. 30, 2024	$ 564.3	$ 697.9	$ (134.5)	$ 0.9		$ 0.0		$ 0.0