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Income Taxes (Tables) | 6 Months Ended
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Jun. 30, 2020
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 |  | $ | 14.4 |  |  | $ | 2.0 |  |  | $ | 16.4 |
Net change for tax positions of prior periods |  |  | (1.2 | ) |  |  | 0.0 |  |  |  | (1.2 | )
Closing balance at June 30 |  |  | 13.2 |  |  |  | 2.0 |  |  |  | 15.2 |
Current |  |  | 0.0 |  |  |  | 0.0 |  |  |  | 0.0 |
Non-current |  | $ | 13.2 |  |  | $ | 2.0 |  |  | $ | 15.2 |

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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=121610041&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -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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