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Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Trade Accounts Receivable [Member] |  |  |  |
Valuation and Qualifying Accounts and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | $ 2.1 | $ 3.1 | $ 1.0
Additions, Charged to Income |  | 0.9 | 0.8 | 4.1
Additions, Other Charges |  | 0.0 | 0.0 | 0.0
Deductions from Reserves | [1] | 1.3 | 1.8 | 2.0
Balance at End of Period |  | 1.7 | 2.1 | 3.1
Finance Receivables – Long-Term [Member] |  |  |  |
Valuation and Qualifying Accounts and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 0.0 | 0.0 | 0.6
Additions, Charged to Income |  | 0.0 | 0.0 | 0.0
Additions, Other Charges |  | 0.0 | 0.0 | 0.0
Deductions from Reserves | [1] | 0.0 | 0.0 | 0.6
Balance at End of Period |  | 0.0 | 0.0 | 0.0
Deferred Tax Assets [Member] |  |  |  |
Valuation and Qualifying Accounts and Reserves [Roll Forward] |  |  |  |
Balance at Beginning of Period |  | 60.0 | 43.0 | 31.6
Additions, Charged to Income |  | 6.5 | 17.0 | 11.4
Additions, Other Charges |  | 0.0 | 0.0 | 0.0
Deductions from Reserves | [1] | 0.0 | 0.0 | 0.0
Balance at End of Period |  | $ 66.5 | $ 60.0 | $ 43.0
[1] | Includes uncollectible accounts written-off.

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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