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Recently Issued and Adopted Accounting Pronouncements and Regulatory Items - Narrative (Details) - USD ($) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 01, 2019 | Jun. 30, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Income tax effects reclassified from AOCI to retained earnings | $ 53.1 | $ (53.1) |
Right-of-use asset |  | 165.8 |
Lease liability |  | 196.0 |
Prepaid rent, accrued rent and lease incentives reclassified |  | 476.2 | $ 432.6
Adoption of accounting standard | 2.4 |  |
Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Right-of-use asset | 185.3 |  |
Lease liability | 215.9 |  |
Prepaid rent, accrued rent and lease incentives reclassified |  | $ (30.6) |
Retained Earnings |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of accounting standard | 55.5 |  |
Retained Earnings | Accounting Standards Update 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Adoption of accounting standard | $ 2.4 |  |

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