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Income Taxes - Balance Sheet Location for Deferred Items and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Contingency [Line Items] |  |  |
Undistributed foreign earnings | $ 7.9 | $ 1.7 |
Deferred tax assets and liabilities |  |  |
Other long-term assets | 1.4 | 1.1 |
Other long-term liabilities | (200.5) | (115.0) |
Net deferred tax liabilities | (199.1) | (113.9) |
Cumulative unremitted earnings and cumulative translation adjustments | 608.0 |  |
Reconciliation of the beginning and ending amount of unrecognized tax benefits |  |  |
Balance at the beginning of the period | 24.6 | 27.7 | $ 23.8
Additions based on tax positions related to current year | 3.0 | 0.6 | 0.9
Additions related to purchase accounting | 15.8 | 0.0 | 3.0
Adjustments for tax positions of prior years | 1.5 | 0.0 | 1.3
Reductions due to statute of limitations | (3.3) | (2.1) | (1.2)
Reductions due to settlements | (1.7) | (1.4) | 0.0
Adjustments due to foreign exchange rates |  | (0.2) | (0.1)
Adjustments due to foreign exchange rates | 0.7 |  |
Balance at the end of the period | 40.6 | 24.6 | 27.7
Uncertain tax position that would impact effective tax rate | 44.3 |  |
Total amount of interest and penalties accrued | $ 6.5 | $ 4.7 | $ 4.9
Number of months within which state and foreign audits may conclude | 12 months |  |
Minimum |  |  |
Income Tax Contingency [Line Items] |  |  |
Decrease in unrecognized tax benefits is reasonably possible | $ 6.0 |  |
Maximum |  |  |
Income Tax Contingency [Line Items] |  |  |
Decrease in unrecognized tax benefits is reasonably possible | $ 7.0 |  |

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