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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gross Unrecognized Income Tax Benefits |  |  |
Gross unrecognized income tax benefits, Beginning Balance | $ 2.8 | $ 2.9 | $ 0.9
Gross amount of increases in unrecognized tax benefits related to prior periods |  | 0.3 | 1.7
Gross amount of decreases in unrecognized tax benefits related to prior periods | (0.4) | (0.4) |
Gross amount of increases in unrecognized tax benefits related to current periods | 51.3 | 0.1 | 0.3
Gross amount of decreases in unrecognized tax benefits related to current periods |  | (0.1) |
Decreases in unrecognized tax benefits relating to settlements with taxing authorities | (2.1) |  |
Gross unrecognized income tax benefits, Ending Balance | 0.3 | 2.8 | 2.9
Accrued Interest and Penalties |  |  |
Unrecognized Tax Benefits, Accrued interest and penalties, Beginning Balance | 0.0 | 0.0 | 0.0
Gross amount of increases in unrecognized tax benefits related to prior periods |  | 0.0 | 0.0
Gross amount of decreases in unrecognized tax benefits related to prior periods | 0.0 | 0.0 |
Gross amount of increases in unrecognized tax benefits related to current period |  | 0.0 | 0.0
Gross amount of decreases in unrecognized tax benefits related to current periods |  | 0.0 |
Decreases in unrecognized tax benefits relating to settlements with taxing authorities | 0.0 |  |
Unrecognized Tax Benefits, Accrued interest and penalties, Ending Balance | $ 0.0 | $ 0.0 | $ 0.0

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- Definition Accrued interest and penalties associated with the gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References No definition available. + Details
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- Definition Accrued interest and penalties associated with the gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities. + References No definition available. + Details
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- Definition Accrued interest and penalties associated with the gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns. + References No definition available. + Details
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- Definition Unrecognized Tax Benefits Income Tax Penalties and Interest Accrued Decreases Resulting from Current Period Tax Positions + References No definition available. + Details
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- Definition Accrued interest and penalties associated with the gross amount of increases in unrecognized tax benefits resulting from tax positions taken in current period tax returns, excluding amounts pertaining to tax returns. + References No definition available. + Details
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- Definition Amount of unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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- Definition Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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