Capital Stock Repurchase Plan Transactions (Narrative) (Details) $ in Millions	Mar. 31, 2020 USD ($)
Capital Stock Repurchase Plan Transactions [Abstract]
Stock repurchase program, amount authorized	$ 250.0
Stock repurchase program, remaining authorized repurchase amount	$ 253.8

Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant