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External Debt and Financing Arrangements - Summary of Outstanding Notes (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Senior Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 1,800.0
Net Carrying Value	1,788.3	$ 1,787.2
4.000% Senior Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 500.0
Issuance Date	2015-06
Maturity Date	2025-06
Net Carrying Value	$ 497.0	496.6
4.000% Senior Notes [Member] | 2018 Senior Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 600.0
Issuance Date	2018-09
Maturity Date	2023-09
Net Carrying Value	$ 597.5	597.1
3.250% Senior Notes [Member] | 2019 Senior Notes [Member]
Debt Instrument [Line Items]
Principal Amount	$ 700.0
Issuance Date	2019-09
Maturity Date	2029-09
Net Carrying Value	$ 693.8	$ 693.5

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Face (par) amount of debt instrument at time of issuance.

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