Commitments and Contingencies, Minimum Commitments (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Minimum rental commitments
Capital Leases - 2019	$ 1.7
Capital Leases - 2020	1.4
Capital Leases - 2021	1.2
Capital Leases - 2022	1.1
Capital Leases - 2023	1.0
Capital Leases - 2024 and thereafter	1.8
Operating leases -2019	6.1
Operating leases - 2020	3.7
Operating leases - 2021	2.8
Operating leases - 2022	2.4
Operating leases - 2023	2.2
Operating leases - 2024 and Thereafter	20.8
Capital Leases, Future Minimum Payments Due	8.2
Operating Leases, Future Minimum Payments Due	38.0
Less: interest	(1.2)
Capital lease obligations	$ 7.0

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910