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Debt - Summary of Issued Senior Unsecured Notes (Details) - Senior Unsecured Notes - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 1,979.6	$ 1,978.5
1.750% Senior Notes due September 2030
Debt Instrument [Line Items]
Long-term debt	$ 1,239.6	1,238.7
Interest rate	1.75%
2.800% Senior Notes due September 2050
Debt Instrument [Line Items]
Long-term debt	$ 740.0	$ 739.8
Interest rate	2.80%

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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