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Fair Value Measurements - Fair Value of Debt Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value | Level 2 |  |
Fair Value of Financial Instruments [Abstract] |  |
Debt | $ 2,260.9 | $ 2,275.5
Carrying Value |  |
Fair Value of Financial Instruments [Abstract] |  |
Debt | $ 2,174.3 | $ 2,215.3

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