Long-Term Debt - U.K. Credit Agreement (Details) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2024	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 05, 2023 GBP (£)	Dec. 04, 2023 GBP (£)	Dec. 31, 2022 USD ($)
Debt Instrument
Long-term debt | $		$ 1,629.2				$ 1,622.1
U.K. credit agreement — revolving credit line
Debt Instrument
Maximum capital expenditures permitted				£ 150,000,000	£ 100,000,000
Maximum credit available			£ 200,000,000
Additional facility capacity under accordion feature			100,000,000
Long-term debt		$ 0.0	£ 0			$ 24.2
U.K. credit agreement — revolving credit line | Subsequent Event
Debt Instrument
Extended term	1 year
U.K. credit agreement — revolving credit line | Minimum | Sterling Overnight Index Average (SONIA)
Debt Instrument
Line of credit basis spread on variable rate (as a percent)		1.10%
U.K. credit agreement — revolving credit line | Maximum | Sterling Overnight Index Average (SONIA)
Debt Instrument
Line of credit basis spread on variable rate (as a percent)		2.10%