Debt - other information (Details) - USD ($) $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 14, 2026	Jun. 30, 2026	Oct. 31, 2025	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Debt Instrument [Line Items]
Interest income				$ 10.2	$ 11.9	$ 31.0	$ 30.8
Debt issuance costs, net			$ 8.0	15.9		15.9		$ 21.6
Gross amount				3,699.7		3,699.7		3,967.9
Amortization of deferred financing costs			4.4			5.3	6.6
Loss on extinguishment of debt				0.8	$ 0.2	2.0	$ 0.2
Amended Revolving Credit Facility Mature In October 2030 | Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity				1,400.0		$ 1,400.0
Revolving credit facility
Debt Instrument [Line Items]
Debt issuance costs, net			3.8
Revolving credit facility, maximum borrowing capacity			$ 1,400.0
Senior secured credit facilities: | Euro term loans B-6 | Euro
Debt Instrument [Line Items]
Interest terms		2.50%				2.50%
Gross amount	$ 427.1			0.0		$ 0.0		645.2
Loss on extinguishment of debt						1.2
Repayments of debt						$ 204.9
Senior secured credit facilities: | Euro term loans B-7 | Euro
Debt Instrument [Line Items]
Interest terms	2.00%	2.00%				2.00%
Gross amount				$ 423.7		$ 423.7		$ 0.0