Hedging Transactions And Derivative Financial Instruments - Summary of Notional Values and Pretax Impact in Fair Values of Net Investment Hedges (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	$ 1,832.9	$ 1,972.9
Gain (Loss) Recognized in OCI	(121.3)	(18.0)
Net investment hedging \| Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	450.0	650.0
Gain (Loss) Recognized in OCI	(8.4)	0.1
Net investment hedging \| Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	650.0	650.0
Gain (Loss) Recognized in OCI	(52.9)	(8.9)
Net investment hedging \| Foreign currency denominated debt
Derivative Instruments, Gain (Loss) [Line Items]
Notional Amount	732.9	672.9
Gain (Loss) Recognized in OCI	$ (60.0)	$ (9.2)

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

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Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

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