Summary of Short-Term Borrowings and Long-Term Debt (Parenthetical) (Details) - USD ($) $ in Millions		1 Months Ended		9 Months Ended
		Jul. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Debt Instrument [Line Items]
Debt instrument, principal periodic payment				$ 300.0	$ 0.0
Term Loan
Debt Instrument [Line Items]
Debt instrument, principal periodic payment		$ 200.0	$ 100.0
Debt instrument amount	[1]			$ 0.0		$ 300.0
Debt instrument maturity date			May 01, 2022

[1] In June 2021, the Company repaid $100.0 principal of the $300.0 term loan due May 1, 2022, with the remaining $200.0 principal repaid in early July 2021.  The term loan was repaid with proceeds from commercial paper borrowings and cash on hand.