Significant Accounting Policies, Leases (Details) - ASU 2016-02 [Member] - Plan [Member] $ in Millions	Mar. 31, 2019 USD ($)
Minimum [Member]
Leases [Abstract]
Expected operating lease, right-of-use assets	$ 60.0
Expected operating lease, liabilities	60.0
Maximum [Member]
Leases [Abstract]
Expected operating lease, right-of-use assets	70.0
Expected operating lease, liabilities	$ 70.0

Present value of lessee's discounted obligation for lease payments from operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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