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Summary of Significant Accounting Policies, Contract Liabilities - Customer Loyalty Programs (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Contract Liabilities - Customer Loyalty Programs [Abstract]
Contract liabilities for customer loyalty programs	$ 13.8	$ 14.9
Calculated under Cost Provision Methodology [Member]
Contract Liabilities - Customer Loyalty Programs [Abstract]
Contract liabilities for customer loyalty programs		1.9
Impact of Adopting ASC Topic 606 [Member]
Contract Liabilities - Customer Loyalty Programs [Abstract]
Contract liabilities for customer loyalty programs		$ 13.0

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 8
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