Accumulated Other Comprehensive Income (Loss) [Roll Forward]

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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- Definition

Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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- Definition

Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Shareholders' Equity Changes in Accumulated Other Comprehensive Income (Loss) Balances (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2020	$ (63.5)	$ (99.6)	$ (58.4)	$ (72.7)
Reclassification to the statement of income			7.0
Change in fair value	(12.9)	12.8	(21.4)	(1.8)
Change in fair value			(22.5)
Balance as of September 30, 2021	(73.9)	$ (84.9)	(73.9)	$ (84.9)
Foreign Currency Items
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2020			(39.1)
Balance as of September 30, 2021	(60.5)		(60.5)
Cash Flow Hedging \| Foreign currency contracts
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2020			(15.5)
Reclassification to the statement of income			6.8
Change in fair value			(1.1)
Balance as of September 30, 2021	(9.8)		(9.8)
Retirement Plan and Other Activity
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance as of December 31, 2020			(3.8)
Reclassification to the statement of income			0.2
Balance as of September 30, 2021	$ (3.6)		$ (3.6)