Notes Payable - Note Issuances (Details) - Notes payable	Dec. 31, 2023 USD ($)	Dec. 31, 2023 GBP (£)	Dec. 31, 2023 EUR (€)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 GBP (£)
5.050% Notes due 2026
Debt
Interest rate (as a percent)	5.05%	5.05%	5.05%
Principal amount | $	$ 500,000,000.0
Price of par value (as a percent)	99.618%	99.618%	99.618%
Effective yield to maturity (as a percent)	5.189%	5.189%	5.189%
4.850% Notes due 2030
Debt
Interest rate (as a percent)	4.85%	4.85%	4.85%
Principal amount | $	$ 600,000,000.0
Price of par value (as a percent)	98.813%	98.813%	98.813%
Effective yield to maturity (as a percent)	5.047%	5.047%	5.047%
4.700% Notes due 2028
Debt
Interest rate (as a percent)	4.70%	4.70%	4.70%
Principal amount | $	$ 400,000,000.0
Price of par value (as a percent)	98.949%	98.949%	98.949%
Effective yield to maturity (as a percent)	4.912%	4.912%	4.912%
4.900% Notes due 2033
Debt
Interest rate (as a percent)	4.90%	4.90%	4.90%
Principal amount | $	$ 600,000,000.0
Price of par value (as a percent)	98.02%	98.02%	98.02%
Effective yield to maturity (as a percent)	5.148%	5.148%	5.148%
4.875% Notes due 2030
Debt
Interest rate (as a percent)	4.875%	4.875%	4.875%
Principal amount | €			€ 550,000,000
Price of par value (as a percent)	99.421%	99.421%	99.421%
Effective yield to maturity (as a percent)	4.975%	4.975%	4.975%
5.125% Notes due 2034
Debt
Interest rate (as a percent)	5.125%	5.125%	5.125%
Principal amount | €			€ 550,000,000
Price of par value (as a percent)	99.506%	99.506%	99.506%
Effective yield to maturity (as a percent)	5.185%	5.185%	5.185%
5.750% Notes due 2031
Debt
Interest rate (as a percent)	5.75%	5.75%	5.75%
Principal amount		£ 300,000,000
Price of par value (as a percent)	99.298%	99.298%	99.298%
Effective yield to maturity (as a percent)	5.862%	5.862%	5.862%
6.000% Notes due 2039
Debt
Interest rate (as a percent)	6.00%	6.00%	6.00%
Principal amount		£ 450,000,000
Price of par value (as a percent)	99.25%	99.25%	99.25%
Effective yield to maturity (as a percent)	6.075%	6.075%	6.075%
1.875% Notes due 2027
Debt
Interest rate (as a percent)	1.875%	1.875%	1.875%	1.875%	1.875%
Principal amount		£ 250,000,000			£ 250,000,000.0
Price of par value (as a percent)				99.487%	99.487%
Effective yield to maturity (as a percent)				1.974%	1.974%
2.500% Notes due 2042
Debt
Interest rate (as a percent)	2.50%	2.50%	2.50%	2.50%	2.50%
Principal amount		£ 250,000,000			£ 250,000,000.0
Price of par value (as a percent)				98.445%	98.445%
Effective yield to maturity (as a percent)				2.584%	2.584%
3.160% Notes due 2030
Debt
Interest rate (as a percent)	3.16%	3.16%	3.16%	3.16%	3.16%
Principal amount		£ 140,000,000			£ 140,000,000.0
Price of par value (as a percent)				100.00%	100.00%
Effective yield to maturity (as a percent)				3.16%	3.16%
3.180% Notes due 2032
Debt
Interest rate (as a percent)	3.18%	3.18%	3.18%	3.18%	3.18%
Principal amount		£ 345,000,000			£ 345,000,000.0
Price of par value (as a percent)				100.00%	100.00%
Effective yield to maturity (as a percent)				3.18%	3.18%
3.390% Notes due 2037
Debt
Interest rate (as a percent)	3.39%	3.39%	3.39%	3.39%	3.39%
Principal amount		£ 115,000,000			£ 115,000,000.0
Price of par value (as a percent)				100.00%	100.00%
Effective yield to maturity (as a percent)				3.39%	3.39%
5.625% Notes due 2032
Debt
Interest rate (as a percent)	5.625%	5.625%	5.625%	5.625%	5.625%
Principal amount | $	$ 750,000,000			$ 750,000,000.0
Price of par value (as a percent)				99.879%	99.879%
Effective yield to maturity (as a percent)				5.641%	5.641%