Financial Instruments (Narrative) (Details) € in Millions, $ in Billions	3 Months Ended
	Sep. 30, 2015 EUR (€)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Debt Instrument [Line Items]
Four Quarter Rolling Average of Notional Amount of Foreign Exchange Contracts Hedging Foreign Currency Transactions		$ 15.4	$ 13.9
Notes 1.250% due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	May 22, 2015
Proceeds from Issuance of Debt | €	€ 750