Derivative Instruments, Foreign Exchange Contracts (Details) - Foreign Exchange Contract [Member] € in Millions, ¥ in Millions, £ in Millions, CAD in Millions, AUD in Millions	9 Months Ended
	Sep. 30, 2016 EUR (€)	Sep. 30, 2016 AUD	Sep. 30, 2016 JPY (¥)	Sep. 30, 2016 CAD	Dec. 31, 2015 GBP (£)	Dec. 31, 2015 EUR (€)	Dec. 31, 2015 AUD	Dec. 31, 2015 CAD
Derivative [Line Items]
Foreign exchange contract outstanding	€ 1.6	AUD 0.7	¥ 341.4	CAD 0.5	£ 0.5	€ 2.1	AUD 0.4	CAD 1.3
Expiration date of contract	Dec. 31, 2018