Supplementary Data Share Repurchase Program (Details) $ in Millions	Mar. 31, 2019 USD ($)
Disclosure of Repurchase Agreements [Abstract]
Stock repurchase program, remaining authorized repurchase amount, excluding fees	$ 338.4

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