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Other Expense Items (Details) $ / shares in Units, $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 USD ($) $ / shares | Mar. 31, 2016 USD ($) $ / shares | Dec. 31, 2016 | Feb. 17, 2016 | Jun. 30, 2013 USD ($)
Other Income and Expenses [Abstract] |  |  |  |  |
Development income | $ (0.4) | $ (0.4) |  |  |
Nonrefundable payment from customer | 14.0 |  |  |  | $ 20.0
Unearned income, current | 1.5 |  |  |  |
Unearned income, noncurrent | $ 12.5 |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Earnings Per Share, Diluted | $ / shares | $ 0.81 | $ 0.30 |  |  |
Venezuela currency devaluation | $ 0.0 | $ 2.7 |  |  |
VENEZUELA |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Foreign currency exchange rate, remeasurement |  |  | 6.3 | 10.0 |
Estimate of possible pre-tax charge | $ 15.0 |  |  |  |
Minimum [Member] | VENEZUELA |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Earnings Per Share, Diluted | $ / shares | $ 0.12 |  |  |  |
Maximum [Member] | VENEZUELA |  |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |  |
Earnings Per Share, Diluted | $ / shares | $ 0.15 |  |  |  |

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