Shareholders' Equity - Weighted Average Ordinary Shares Outstanding (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Weighted average shares outstanding
Basic weighted average ordinary shares outstanding (in shares)	232.7	240.6	233.0	241.4
Dilutive effect of potentially issuable shares (in shares)	0.9	2.2	1.1	1.8
Diluted weighted average ordinary shares outstanding (in shares)	233.6	242.8	234.1	243.2