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Income Taxes (Tables) | 9 Months Ended
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Sep. 30, 2019
Income Tax Disclosure [Abstract] |
Roll-forward of Unrecognized Tax Benefits and Associated Accrued Interest and Penalties | A roll-forward of unrecognized tax benefits and associated accrued interest and penalties is as follows:
(in millions) |  | Unrecognized Tax Benefits |  |  | Interest and Penalties |  |  | Total |
Opening balance at January 1 |  | $ | 13.4 |  |  | $ | 0.6 |  |  | $ | 14.0 |
Additions for tax positions of prior periods |  |  | 0.0 |  |  |  | 0.9 |  |  |  | 0.9 |
Closing balance at September 30 |  |  | 13.4 |  |  |  | 1.5 |  |  |  | 14.9 |
Current |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 |
Non-current |  | $ | 13.4 |  |  | $ | 1.5 |  |  | $ | 14.9 |

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=117331294&loc=d3e36027-109320 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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