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Debt - Summary of Debt (Details) - USD ($) $ in Millions		Sep. 30, 2021	Sep. 21, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long term debt		$ 3,190.4		$ 2,493.7
Less current portion	[1]	698.1		0.0
Less unamortized debt issuance costs		21.2		14.3
Total Long term debt		2,471.1		2,479.4
Revolving Credit Facility, due August 2021 | Line Of Credit
Debt Instrument [Line Items]
Long term debt		0.0		0.0
Revolving Credit Facility, due June 2026 | Line Of Credit
Debt Instrument [Line Items]
Long term debt		0.0		0.0
4.50% Senior Notes, due November 2023 | Senior Notes
Debt Instrument [Line Items]
Long term debt		$ 699.5		$ 699.4
Stated interest rate		4.50%		4.50%
3.65% Senior Notes, due September 2024 | Senior Notes
Debt Instrument [Line Items]
Long term debt		$ 399.6		$ 399.5
Stated interest rate		3.65%		3.65%
3.40% Senior Notes, due December 2027 | Senior Notes
Debt Instrument [Line Items]
Long term debt		$ 498.9		$ 498.8
Stated interest rate		3.40%		3.40%
3.00% Senior Notes, due December 2029 | Senior Notes
Debt Instrument [Line Items]
Long term debt		$ 499.5		$ 499.4
Stated interest rate		3.00%		3.00%
4.05% Senior Notes, due December 2049 | Senior Notes
Debt Instrument [Line Items]
Long term debt		$ 396.6		$ 396.6
Stated interest rate		4.05%		4.05%
3.05% Senior Notes, due October 2051 | Senior Notes
Debt Instrument [Line Items]
Long term debt		$ 696.3		$ 0.0
Stated interest rate		3.05%	3.05%
[1] The current portion of long-term debt excludes unamortized debt issuance costs of $1.4 million at September 30, 2021.

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