Borrowings - Narrative (Details) - USD ($) $ in Millions			3 Months Ended	12 Months Ended
	Jan. 04, 2022	Mar. 09, 2021	Mar. 31, 2021	Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021	Nov. 30, 2023	Nov. 25, 2019	Dec. 18, 2018	Jun. 11, 2018	Aug. 22, 2017	Mar. 15, 2017	Oct. 31, 2016	Jun. 21, 2010	Nov. 17, 2006
Long-term and Short-term Debt Instruments
Weighted-average effective interest rate (as a percent)				4.00%
Total borrowings at par value				$ 2,514.9		$ 2,630.0
Maturity date				Nov. 30, 2028
Repayment of long-term debt				$ 300.0		300.0		$ 1,150.0
Total premium paid to redeem								14.3
Commercial Paper
Long-term and Short-term Debt Instruments
Threshold over which Commercial Paper Program limit will be reduced for borrowings on Revolving Credit Facility				$ 1,250.0
Maximum days to maturity				397 days
Weighted-average effective interest rate (as a percent)				5.60%
Weighted-average term				3 days
Total borrowings at par value				$ 364.9		180.0
Revolving Credit Facility
Long-term and Short-term Debt Instruments
Maximum borrowing capacity									$ 1,250.0		$ 1,500.0
EBITDA interest coverage ratio				300
Facility fee (as a percent)				0.11%
Revolver balance outstanding at the end of period				$ 0.0		0.0
Revolving Credit Facility | Maximum
Long-term and Short-term Debt Instruments
Facility fee (as a percent)				0.20%
Revolving Credit Facility | Minimum
Long-term and Short-term Debt Instruments
Facility fee (as a percent)				0.08%
Revolving Credit Facility | Base Rate [Member]
Long-term and Short-term Debt Instruments
Interest rate margin on revolving credit facility (as a percent)				0.14%
Revolving Credit Facility | Base Rate [Member] | Maximum
Long-term and Short-term Debt Instruments
Interest rate margin on revolving credit facility (as a percent)				0.425%
Revolving Credit Facility | Base Rate [Member] | Minimum
Long-term and Short-term Debt Instruments
Interest rate margin on revolving credit facility (as a percent)				0.00%
Revolving Credit Facility | SOFR [Member]
Long-term and Short-term Debt Instruments
Interest rate margin on revolving credit facility (as a percent)				1.14%
Revolving Credit Facility | SOFR [Member] | Maximum
Long-term and Short-term Debt Instruments
Interest rate margin on revolving credit facility (as a percent)				1.425%
Revolving Credit Facility | SOFR [Member] | Minimum
Long-term and Short-term Debt Instruments
Interest rate margin on revolving credit facility (as a percent)				0.92%
Letter of Credit Sub-Facility
Long-term and Short-term Debt Instruments
Maximum borrowing capacity									250.0		250.0
Swing Line Sublimit
Long-term and Short-term Debt Instruments
Maximum borrowing capacity									$ 300.0
Term Loan Facility Borrowing
Long-term and Short-term Debt Instruments
Maximum borrowing capacity											$ 950.0
Outstanding borrowings under term loan facility															$ 575.0
Repayment of long-term debt	$ 300.0		$ 650.0
1.350% Notes Due 2026
Long-term and Short-term Debt Instruments
Total borrowings at par value		$ 600.0		$ 600.0	[1]	$ 600.0	[1]
Stated interest rate (as a percent)		1.35%		1.35%		1.35%
Repurchase provisions, percentage of principal				101.00%
1.350% Notes Due 2026 | Base Rate [Member]
Long-term and Short-term Debt Instruments
Basis spread on applicable treasury rate (as a percent)		0.15%
2.750% Notes Due 2031
Long-term and Short-term Debt Instruments
Total borrowings at par value		$ 300.0		$ 300.0	[1]	$ 300.0	[1]
Stated interest rate (as a percent)		2.75%		2.75%		2.75%
Repurchase provisions, percentage of principal				101.00%
2.750% Notes Due 2031 | Base Rate [Member]
Long-term and Short-term Debt Instruments
Basis spread on applicable treasury rate (as a percent)		0.25%
2.850% Notes Due 2025
Long-term and Short-term Debt Instruments
Total borrowings at par value				$ 500.0	[1]	$ 500.0	[1]			$ 500.0
Stated interest rate (as a percent)				2.85%		2.85%				2.85%
Premium on early redemptions (as a percent)				0.20%
Repurchase provisions, percentage of principal				101.00%
4.250% Notes Due 2023
Long-term and Short-term Debt Instruments
Total borrowings at par value						$ 300.0	[2]					$ 300.0
Stated interest rate (as a percent)				4.25%		4.25%
Repurchase provisions, percentage of principal				101.00%
3.600% Notes Due 2022
Long-term and Short-term Debt Instruments
Total borrowings at par value								500.0					$ 100.0	$ 400.0
Stated interest rate (as a percent)						3.60%
Total premium paid to redeem								$ 14.3
6.200% Notes Due 2040
Long-term and Short-term Debt Instruments
Total borrowings at par value				$ 250.0	[1]	$ 250.0	[1]									$ 250.0
Stated interest rate (as a percent)				6.20%		6.20%										6.20%
Premium on early redemptions (as a percent)				0.30%
Repurchase provisions, percentage of principal				101.00%
6.200% Notes Due 2036
Long-term and Short-term Debt Instruments
Total borrowings at par value				$ 500.0	[1]	$ 500.0	[1]										$ 500.0
Stated interest rate (as a percent)				6.20%		6.20%											6.20%
Premium on early redemptions (as a percent)				0.25%

[1] The difference between the stated interest rate and the effective interest rate is not significant.

[2] Commercial paper and cash, including cash generated from operations, were used to repay $300.0 million of the aggregate principal amount of 4.250% unsecured notes due in June 2023.