Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Operating losses	$ 62.3	$ 69.3
Interest expense carryforward	153.5	121.4
Bad debts	5.1	5.3
Accrued expenses	9.5	8.8
Capital loss and credit carryforwards	15.4	15.7
Pension and postretirement benefits	33.9	30.9
Foreign exchange	9.0	0.0
ASC 842 - Lease liability	16.0	20.8
Equity Compensation	10.5	10.2
Other	9.3	11.4
Total deferred tax assets	324.5	293.8
Valuation allowance	(37.0)	(39.4)
Net deferred tax assets	287.5	254.4
Deferred tax liabilities:
Intangibles	(1,230.8)	(1,388.3)
Commission Assets	(35.6)	(29.1)
Fixed assets	(12.5)	(5.1)
ASC 842 - ROU asset	(15.1)	(19.1)
Other	(1.2)	(1.5)
Total deferred tax liabilities	(1,295.2)	(1,443.1)
Net deferred tax (liabilities) assets	$ (1,007.7)	$ (1,188.7)