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Borrowings and Lines of Credit - Schedule of Interest Expense and Interest Income (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 09, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Document Fiscal Year Focus |  | 2018 |  |
Interest expense(1) |  | $ 16.6 | $ 20.8 | $ 20.5
Interest income |  | (0.6) | (0.2) | (0.1)
Interest Revenue (Expense), Net |  | (16.0) | (20.6) | (20.4)
Write off of Deferred Debt Issuance Cost | $ 0.7 | 0.4 |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Two |  | 0.0 |  |
Long-term Debt, Maturities, Repayments of Principal in Year Three |  | 172.5 |  |
Convertible Debt | Convertible Notes Due Twenty Twenty One [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest Expense, Debt, Excluding Amortization |  | 5.6 | 5.6 | 3.7
Interest Expense, Debt |  | 12.8 | $ 12.3 | $ 7.9
Maturities of Long-term Debt [Abstract] |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four |  | $ 9.0 |  |

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