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Income Taxes - Income Tax Contingencies (Details) $ in Millions, ₩ in Billions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 USD ($) | Dec. 31, 2016 KRW (₩) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Income Tax Disclosure [Abstract] |  |  |  |  |
Increase (decrease) in additional liabilities related to unrecognized tax liabilities |  |  | $ 11.2 | $ 22.4 |
Increase (decrease) in assets related to unrecognized tax assets |  |  | (0.1) | (0.4) |
Decrease in Unrecognized Tax Liabilities related to a foreign currency translation expense |  |  | 0.1 | 0.7 |
Unrecognized tax liabilities | $ 68.6 |  | 68.6 | 56.1 |
Unrecognized tax assets | 1.6 |  | 1.6 | 1.9 |
Reconciliation of total amounts of unrecognized income tax benefits |  |  |  |  |
Unrecognized Tax Liabilities – opening balance |  |  | 46.7 | 24.3 | $ 26.5
Gross increases – tax positions in prior period |  |  | 18.0 | 9.2 | 0.0
Gross decreases – tax positions in prior period |  |  | (15.4) | (4.8) | (2.8)
Gross increases – tax positions in current period |  |  | 11.3 | 20.9 | 6.6
Gross decreases – tax positions in current period |  |  | 0.0 | 0.0 | 0.0
Settlements |  |  | 0.0 | 0.0 | (3.6)
Lapse of statute of limitations |  |  | (2.8) | (2.9) | (2.4)
Unrecognized Tax Liabilities – ending balance | 57.8 |  | 57.8 | 46.7 | 24.3
Expected reduction in income tax expense if uncertain tax positions are settled by the taxing authorities in the entity's favor | 56.6 |  | $ 56.6 |  |
Expected reduction in effective income tax rate if uncertain tax positions are settled by the taxing authorities in the entity's favor (as a percent) |  |  | 39.80% |  |
Interest and penalties expense |  |  |  |  |
Interest related to unrecognized tax benefits, recorded as income (expense) |  |  | $ (0.7) | 0.9 | 0.6
Penalties related to unrecognized tax benefits, recorded as income tax (income) expense |  |  | (2.3) | (0.3) | $ (0.3)
Accrued interest and penalties |  |  |  |  |
Accrued interest related to unrecognized tax benefits | 4.3 |  | 4.3 | 5.2 |
Accrued penalties related to unrecognized tax benefits | 6.5 |  | $ 6.5 | $ 4.2 |
SRTO |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Pre-assessment notice, amount | $ 8.0 | ₩ 9.2 |  |  |

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