Shareholders' Equity - Share Repurchase Programs (Details) - Ordinary Options - November 2016 Share Repurchase Program $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Stock Activity [Line Items]
Total amount authorized for repurchase of shares under share repurchase program	$ 1,500.0
Shares repurchased	$ 139.1
Shares repurchased (in shares) | shares	1.1
Average price of shares repurchased (in dollars per share) | $ / shares	$ 122.91
Remaining amount authorized for repurchase of shares	$ 438.7