Shareholders' Equity - Share Repurchase Programs (Details) - Ordinary Options - November 2016 Share Repurchase Program $ / shares in Units, shares in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares
Stock Activity [Line Items]
Total amount authorized for repurchase of shares under share repurchase program	$ 1,500,000,000	$ 1,500,000,000
Shares repurchased	0	$ 146,500,000
Shares repurchased (in shares) | shares		1.2
Average price of shares repurchased (in dollars per share) | $ / shares		$ 121.98
Remaining amount authorized for repurchase of shares	$ 431,200,000	$ 431,200,000