Common Stock Common Stock (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Aug. 07, 2019	Apr. 17, 2019	Dec. 31, 2018
Common Stock (Narrative) [Abstract]
Accelerated Share Repurchases, Settlement (Payment) or Receipt		$ 150.0
Treasury shares received in ASR		1,994,327
PercentagofTotalSharestobeDelivered		75.00%
Common Stock, Shares Authorized	140,000,000		140,000,000	120,000,000