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Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Senior Notes | Senior Notes Due 2021 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instruments at fair value | $ 282.2 |
Senior Notes | Senior notes due 2020 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instruments at fair value |  | $ 623.1
Senior Notes | Senior notes due 2022 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instruments at fair value |  | 310.6
Line of Credit | Term loan A |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instruments at fair value |  | 307.7
Line of Credit | Term loan B |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt instruments at fair value |  | $ 116.7

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