Schedule II - Valuation and Qualifying Accounts and Reserves (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts Receivable
Valuation and Qualifying Accounts and Reserves
Additions		$ 0.3
Balance at end of period	0.3	0.3
Notes issued under par
Valuation and Qualifying Accounts and Reserves
Balance at beginning of period	46.2	47.3	25.4
Charged to costs and expenses	1.1	1.1	0.5
Additions			22.4
Balance at end of period	45.1	46.2	47.3
Deferred Tax Assets
Valuation and Qualifying Accounts and Reserves
Balance at beginning of period			2.2
Deductions/Applications			$ 2.2

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible and portions of the reserves utilized, respectively.

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