Equity (Reconciliation of Ordinary Shares) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Ordinary shares [Member]
Beginning balance, shares	266.4	274.0	271.7
Shares issued under incentive plans	2.8
Repurchase of ordinary shares	(6.4)	(9.7)	0.0
Ending balance, shares	262.8	266.4	274.0
Treasury Stock [Member]
Beginning balance, shares	24.5
Shares issued under incentive plans	0.0
Repurchase of ordinary shares	0.0
Ending balance, shares	24.5	24.5