Debt - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Sep. 15, 2024
Debt Instrument [Line Items]
Debt instrument, maturity date			Sep. 15, 2024
Cash payments paid for interest			$ 61.4	$ 49.9
Amortization of financing costs	$ 0.5	$ 0.4	1.4	$ 1.2
Total	$ 2,492.1		$ 2,492.1		$ 2,891.7
3.65% Senior Notes, due September 2024
Debt Instrument [Line Items]
Stated interest rate						3.65%
Debt instrument, redemption amount included premiums, accrued and unpaid interest						$ 407.3
Senior Notes | 5.70% Senior Note, Due November 2023
Debt Instrument [Line Items]
Stated interest rate						5.70%
Senior Notes | 3.65% Senior Notes, due September 2024
Debt Instrument [Line Items]
Stated interest rate	3.65%		3.65%		3.65%	3.65%
Debt instrument, maturity date			Sep. 15, 2024		Sep. 15, 2024
Total	$ 0.0		$ 0.0		$ 399.9
Senior Notes | Fixed-Rate Senior Notes
Debt Instrument [Line Items]
Book value of fixed rate debt	2,492.1		2,492.1
Long-term debt (fixed-rate debt), fair value	$ 2,208.8		$ 2,208.8