Stock Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company recognized total stock compensation expense, net of forfeitures	$ 29.2	$ 36.6	$ 25.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning balance	400,000	700,000
Nonvested, ending balance	100,000	400,000	700,000
Director Stock Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 2.0	$ 1.6	$ 1.5
Intrinsic value of the unvested	$ 2,600,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	4 months
Number of shares granted	81,000	68,000	36,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 0.7
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning balance	63,000	36,000	65,000
Vested during period	(63,000)	(41,000)	(65,000)
Forfeited during period	0	0	0
Nonvested, ending balance	81,000	63,000	36,000
Restricted Share Activity [Roll Forward]
Nonvested, beginning balance, value	$ 2.0	$ 1.6	$ 1.2
Granted during period, value	2.0	2.2	1.6
Vested during period, value	(2.0)	(1.8)	(1.2)
Forfeited during period, value	0.0	0.0	0.0
Nonvested, ending balance, value	$ 2.0	$ 2.0	1.6
Market Based LTIA [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted		162,102
Grant Date Of Fair Value Of Shares Granted		$ 9.8
Long Term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of the unvested	$ 66,000,000.0
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months 12 days
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 33.4
Long Term Incentive Plan [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 24.2	$ 32.1	$ 24.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested, beginning balance	1,703,000	1,402,000	1,479,000
Granted during period	1,694,000	839,000	763,000
Vested during period	(494,000)	(396,000)	(305,000)
Forfeited during period	(824,000)	(142,000)	(535,000)
Nonvested, ending balance	2,079,000	1,703,000	1,402,000
Restricted Share Activity [Roll Forward]
Nonvested, beginning balance, value	$ 82.7	$ 68.9	$ 80.5
Granted during period, value	49.7	46.0	36.7
Vested during period, value	(23.8)	(20.6)	(20.6)
Forfeited during period, value	(38.6)	(11.6)	(27.7)
Nonvested, ending balance, value	$ 70.0	$ 82.7	$ 68.9
Service Based LTIA [Member] | Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted		570,914
Grant Date Of Fair Value Of Shares Granted		$ 26.9
Restricted Stock Units (RSUs) [Member] | LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	553,578
Share-based Payment Arrangement | LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Of Fair Value Of Shares Granted	$ 24.0
Performance Shares | LTIP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted	284,653
Grant Date Of Fair Value Of Shares Granted	$ 22.0
Union ratification stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Expense	$ 0.6	$ 3.0
Number of shares granted	22,594	93,565