Long-Term Debt - Senior Unsecured Notes Repurchases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020
Senior Unsecured Notes, Tender Offer
Debt Instrument
Debt repurchased	$ 700.0
Aggregate payments	(705.3)
Net discount on repurchased debt	(1.0)
Gain (loss) on extinguishment of debt	(6.3)
Senior Unsecured Notes, Open Market Transactions
Debt Instrument
Debt repurchased	23.1	$ 67.7
Aggregate payments	(22.5)	(36.0)
Net discount on repurchased debt	0.0	(0.3)
Accrued interest on repurchased debt	0.0	0.6
Gain (loss) on extinguishment of debt	$ 0.6	$ 32.0