Equity Equity (Narrative) (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 € / shares shares
Common Stock, Par or Stated Value Per Share | € / shares			€ 1.00
Capital Units, Authorized	1,185,040,000		1,185,040,000
Treasury Stock, Shares, Acquired	0
Repurchase of ordinary shares | $	$ (500.1)	$ (514.1)
Preferred Stock [Member]
Preferred Stock, Shares Authorized	10,000,000		10,000,000
Ordinary shares
Common Stock, Shares Authorized	40,000		40,000
Par Value US [Member]
Common Stock, Par or Stated Value Per Share | $ / shares	$ 1.00
Preferred Stock, Par or Stated Value Per Share | $ / shares	$ 0.001
Par Value US [Member] | Ordinary shares
Common Stock, Shares Authorized	1,175,000,000		1,175,000,000