Credit Facilities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2016 USD ($)
Line of Credit Facility [Abstract]
Line of Credit Facility, Expiration Date	Oct. 20, 2020
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000.0
Line of Credit Facility, Available Capacity Increase Amount	250.0
Line of Credit Facility, Limit on Letters of Credit	$ 200.0