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Significant Accounting Policies - Cash Flow Impact of New Accounting Pronouncements (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash provided by operating activities | $ 197.8 | $ 215.1 | $ 231.4 |
Cash, cash equivalents and restricted cash |  | 85.5 | 83.0 | $ 104.2
Net increase (decrease) in cash, cash equivalents, and restricted cash |  | 2.0 | (21.2) |
Effect of exchange rate changes on cash | $ (0.8) | 0.5 | 0.0 |
As Previously Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash provided by operating activities |  | 218.2 | 226.8 |
Cash, cash equivalents and restricted cash |  | 54.3 | 48.7 | 74.5
Net increase (decrease) in cash, cash equivalents, and restricted cash |  | 5.1 | (25.8) |
Effect of exchange rate changes on cash |  | 0.5 | 0.0 |
Adoption of ASU 2016-18 | Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Net cash provided by operating activities |  | (3.1) | 4.6 |
Cash, cash equivalents and restricted cash |  | 31.2 | 34.3 | $ 29.7
Net increase (decrease) in cash, cash equivalents, and restricted cash |  | (3.1) | 4.6 |
Effect of exchange rate changes on cash |  | $ 0.0 | $ 0.0 |

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