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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Summary of the Affects of New Accounting Pronouncements | The cumulative effects of the changes made to our accompanying consolidated balance sheets as of January 1, 2019 for the adoption of ASC 842 were as follows:
(in millions) | As Reported at December 31, 2018 |  | Adoption of ASC 842 |  | Balance at January 1, 2019
ASSETS |  |  |  |  |
Other current assets | $ | 22.4 |  |  | $ | (0.3) |  |  | $ | 22.1 |
Property and equipment, net | 757.5 |  |  | 25.3 |  |  | 782.8 |
LIABILITIES |  |  |  |  |
Accrued expense and other current liabilities | 89.8 |  |  | 3.8 |  |  | 93.6 |
Other liabilities | 15.7 |  |  | 21.5 |  |  | 37.2 |
SHAREHOLDERS' EQUITY |  |  |  |  |
Retained earnings | 474.2 |  |  | (0.3) |  |  | 473.9 |

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e765-108305 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=116846552&loc=d3e725-108305 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22583-107794 + Details
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