Derivatives (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended	36 Months Ended
	Jun. 30, 2015	Apr. 30, 2018
Cross Currency interest rate swap, term		3 years
Cross Currency Interest Rate Swap on Intercompany Borrowings	$ 193.0
Cross currency interest rate swap, maturity date		Apr. 01, 2018
Changes in Fair Value of Derivatives Not Designated As Hedges, Immaterial Assertion	not material
Fair Value Of Non Hedge Derivatives Immaterial Assertion	0
Fair value hedge ineffectiveness	0
Cash flow hedge ineffectiveness	0
Cash Flow Hedge Income to be Reclassified within Twelve Months	$ 2.2