Derivative Instruments, Foreign Exchange Contracts (Details) - Foreign Exchange Contract [Member] € in Millions, ¥ in Millions, CAD in Millions, AUD in Millions	3 Months Ended
	Mar. 31, 2017 CAD	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 JPY (¥)	Mar. 31, 2017 AUD	Dec. 31, 2016 CAD	Dec. 31, 2016 EUR (€)	Dec. 31, 2016 JPY (¥)	Dec. 31, 2016 AUD
Derivative [Line Items]
Foreign exchange contract outstanding	CAD 0.3	€ 0.2	¥ 281.4	AUD 0.4	CAD 0.5	€ 0.1	¥ 281.4	AUD 0.6
Expiration date of contract	Dec. 31, 2018