Notes Payable and Indebtedness - Summary (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 20, 2022	Dec. 31, 2021	Dec. 20, 2021
Debt maturing within one year:
Principal amount	$ 32.7	$ 32.7
Debt issuance costs and discount	0.0	0.0
Carrying value	32.7	32.7
Debt maturing after one year:
Principal amount	3,555.9	3,613.9
Debt issuance costs and discount	43.4	61.7
Carrying value	3,512.5	3,552.2
Total debt
Principal amount	3,588.6	3,646.6
Debt issuance costs and discount	43.4	61.7
Carrying value	3,545.2	3,584.9
Term Loan Due 2026 | Line of Credit | Secured Debt
Debt maturing within one year:
Principal amount	28.1	28.1
Debt issuance costs and discount	0.0	0.0
Carrying value	28.1	28.1
Debt maturing after one year:
Principal amount	2,623.6	2,651.7
Debt issuance costs and discount	33.0	49.2
Carrying value	2,590.6	2,602.5
Term Loan Due 2029 | Line of Credit | Secured Debt
Debt maturing within one year:
Principal amount	4.6	4.6
Debt issuance costs and discount	0.0	0.0
Carrying value	4.6	4.6
Debt maturing after one year:
Principal amount	447.3	451.9
Debt issuance costs and discount	5.3	6.5
Carrying value	442.0	445.4
Revolving facility | Line of Credit | Revolving Credit Facility
Debt maturing after one year:
Principal amount	25.0	50.3
Debt issuance costs and discount	0.0	0.0
Carrying value	$ 25.0	50.3
Total debt
Maximum ratio of first lien net indebtedness to consolidated EBITDA	6.75
Applicable threshold for maximum ratio of first lien net indebtedness to consolidated EBITDA (as a percent)	35.00%
5.000% Senior Unsecured Notes Due 2029 | Unsecured Debt Excluding Current Maturities
Debt maturing after one year:
Principal amount	$ 460.0	460.0
Debt issuance costs and discount	5.1	6.0
Carrying value	$ 454.9	$ 454.0
5.000% Senior Unsecured Notes Due 2029 | Unsecured Debt
Total debt
Interest rate on debt instrument (as a percent)		5.00%	5.00%	5.00%	5.00%