Equity (Reconciliation of Ordinary Shares) (Details) shares in Millions	3 Months Ended
	Mar. 31, 2017 shares
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Repurchase of ordinary shares	(3.1)
Common Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	271.7
Shares issued under incentive plans, net	1.5
Repurchase of ordinary shares	0.0
Ending balance	273.2
Treasury Stock [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	12.7
Shares issued under incentive plans, net	0.0
Ending balance	15.8