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Shareholders' Equity - Narrative (Details)	1 Months Ended		3 Months Ended				6 Months Ended
	Apr. 30, 2021 USD ($)	May 31, 2020 USD ($) shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2021 USD ($) SFr / shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2020 SFr / shares	Sep. 30, 2021 USD ($) $ / shares	Sep. 30, 2021 USD ($) SFr / shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2020 SFr / shares	Mar. 31, 2017 USD ($) shares
Class of Stock [Line Items]
Cash dividends per share (in dollars per share) | (per share)			$ 0.95	SFr 0.87	$ 0.87	SFr 0.79	$ 0.95	SFr 0.87	$ 0.87	SFr 0.79
Payment of cash dividends			$ 159,400,000		$ 146,700,000		$ 159,410,000		$ 146,705,000
March 2017
Class of Stock [Line Items]
Authorized amount in buyback program											$ 250,000,000
Shares authorized to be repurchased (in shares) | shares											17,300,000
May 2020
Class of Stock [Line Items]
Authorized amount in buyback program		$ 250,000,000
Shares authorized to be repurchased (in shares) | shares		17,300,000
Period to complete share repurchase program		3 years
Increase in authorized amount	$ 750,000,000
Amount available for repurchase			$ 661,000,000.0	SFr 661,000,000.0			$ 661,000,000.0	SFr 661,000,000.0
April 2021
Class of Stock [Line Items]
Authorized amount in buyback program	$ 1,000,000,000

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