Acquisitions Number of Acquisitions (Details) - business	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Number of acquisitions [Abstract]
Number of Businesses Acquired	1	2

The number of businesses acquired by the entity during the period.

No definition available.

Name:	us-gaap_NumberOfBusinessesAcquired
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration