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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Decrease to customer deposits | $ (1,800.0) |  | $ (1,400.0)
Effect of change on net income | $ 9.2 |  |
Effect of change on basic earnings per share (in dollars per share) | $ 0.04 |  |
Effect of change on diluted earnings per share (in dollars per share) | $ 0.04 |  |
Debt | Accounting Standards Update 2017-12 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  | $ 14.4 |
Retained Earnings | Accounting Standards Update 2016-16 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  | (6.6) |
Retained Earnings | Accounting Standards Update 2017-12 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  | (16.9) |
AOCI Attributable to Parent | Accounting Standards Update 2017-12 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative effect of new accounting principle in period of adoption |  | 2.5 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Prepaid expenses and other assets |  | 64.6 |
Decrease to customer deposits |  | $ 64.6 |

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