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Revenue Recognition (Up-Front Customer Loyalty Programs) (Details) - Up front customer loyalty programs - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2019 | Dec. 31, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] |  |
Capitalized customer acquisition costs | $ 137.4 | $ 124.4
Capitalized customer acquisition costs recognized as a reduction of revenue | $ 34.6 |

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- Definition Amount, before accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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