Borrowings - Schedule of Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Sep. 30, 2025	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Aggregate Principal Amount	$ 3,026.1		$ 3,026.1		$ 3,025.1
Interest Expense	$ 27.8	$ 17.4	$ 55.3	$ 34.6
3.500% Senior Notes Due 9/19/2029
Debt Instrument [Line Items]
Interest rate (percent)	3.50%		3.50%
Aggregate Principal Amount	$ 425.0		$ 425.0		425.0
5.050% Senior Notes Due 9/19/2035
Debt Instrument [Line Items]
Interest rate (percent)	5.05%		5.05%
Aggregate Principal Amount	$ 800.0		$ 800.0		800.0
5.625% Senior Notes Due 3/30/2043
Debt Instrument [Line Items]
Interest rate (percent)	5.625%		5.625%
Aggregate Principal Amount	$ 600.0		$ 600.0		600.0
5.650% Senior Notes Due 9/15/2048
Debt Instrument [Line Items]
Interest rate (percent)	5.65%		5.65%
Aggregate Principal Amount	$ 350.0		$ 350.0		350.0
Senior Notes \| 3.500% Senior Notes Due 9/19/2029
Debt Instrument [Line Items]
Interest rate (percent)	3.50%		3.50%
Aggregate Principal Amount	$ 425.0		$ 425.0
Fair Value	412.4		412.4		417.8
Interest Expense	$ 3.9	3.9	$ 7.7	7.7
Senior notes percentage of par value (percent)							99.841%
Senior Notes \| 5.050% Senior Notes Due 9/19/2035
Debt Instrument [Line Items]
Interest rate (percent)	5.05%		5.05%
Aggregate Principal Amount	$ 800.0		$ 800.0
Fair Value	777.8		777.8		800.9
Interest Expense	10.4	0.0	20.7	0.0
Senior notes percentage of par value (percent)						99.767%
Senior Notes \| 5.625% Senior Notes Due 3/30/2043
Debt Instrument [Line Items]
Aggregate Principal Amount	600.0		600.0						$ 200.0	$ 400.0
Fair Value	584.4		584.4		600.7
Interest Expense	8.5	8.5	16.9	16.9
Senior notes percentage of par value (percent)									104.315%	99.583%
Senior Notes \| 5.650% Senior Notes Due 9/15/2048
Debt Instrument [Line Items]
Aggregate Principal Amount	350.0		350.0
Fair Value	339.3		339.3		$ 347.5
Interest Expense	$ 5.0	$ 5.0	$ 10.0	$ 10.0
Senior notes percentage of par value (percent)								99.914%