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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Valuation Allowance      
Reconciliation of beginning and ending balances of valuation and qualifying accounts      
Balance Beginning of Period $ 22.1 $ 20.5 $ 18.4
Additions Charged to Costs and Expenses 1.1 1.3 2.1
Additions Charged to Other Accounts 0.9 0.3 0.0
Deductions 0.0 0.0 0.0
Balance End of Period 24.1 22.1 20.5
Other Allowances      
Reconciliation of beginning and ending balances of valuation and qualifying accounts      
Balance Beginning of Period [1] 10.3 10.6 12.1
Additions Charged to Costs and Expenses [1] 0.6 5.0 0.7
Additions Charged to Other Accounts [1] 0.0 0.0 0.0
Deductions [1] 7.3 5.3 2.2
Balance End of Period [1] $ 3.6 $ 10.3 $ 10.6
[1] Other Allowances represented reserves on notes received in connection with transfers of our interests in certain Affiliates, as well as other receivable amounts, which we considered uncollectible. Deductions represent the reversal of such reserves upon collection of the amounts due.