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Accounting Policies - Recently Adopted Accounting Standards (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Jan. 01, 2017
New Accounting Pronouncements |  |  |  |
Tax benefit of stock awards exercised | $ 0.4 | $ 0.3 |  |
Non-current deferred tax asset | 3.0 |  | $ 1.6 |
Noncurrent deferred tax liability | 48.6 |  | 55.2 |
Long-term Debt | 653.6 |  | 499.5 |
Unamortized debt issuance costs | 3.2 |  | $ 2.4 |
Previously Reported |  |  |  |
New Accounting Pronouncements |  |  |  |
Current deferred tax assets | 38.6 |  |  |
Non-current deferred tax asset | 1.5 |  |  |
Noncurrent deferred tax liability | 85.7 |  |  |
Accounting Standards Update 2015-17 | Adjustment |  |  |  |
New Accounting Pronouncements |  |  |  |
Non-current deferred tax asset | 1.5 |  |  |
Noncurrent deferred tax liability | 38.6 |  |  |
Accounting Standards Update 2016-09 |  |  |  |
New Accounting Pronouncements |  |  |  |
Cumulative effect adjustment |  |  |  | $ 0.5
Tax benefit of stock awards exercised | $ 0.4 |  |  |

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