Debt - Debt Outstanding (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022		Sep. 22, 2020
Debt Instrument [Line Items]
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2023 - $1,213.4; 2022 - $1,195.1)	$ 1,389.2	$ 1,386.9	[1]
Senior Notes | Senior Notes, 4.35 Percent Due February 15, 2025
Debt Instrument [Line Items]
Stated interest rate, percentage	4.35%
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2023 - $1,213.4; 2022 - $1,195.1)	$ 449.6	449.3
Senior Notes | Senior Notes, 2.400 Percent Due September 30, 2030
Debt Instrument [Line Items]
Stated interest rate, percentage				2.40%
Long-term Debt, Current and Non-current, at Amortized Cost (Fair Value: 2023 - $1,213.4; 2022 - $1,195.1)	$ 397.0	$ 396.6

[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.