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Fair Value Measurements - Debt (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Fixed interest rate debt |  |
Fair value of financial instruments |  |
Debt instrument, fair value | $ 2,975.1 | $ 3,652.3
Variable rate debt |  |
Fair value of financial instruments |  |
Debt instrument, fair value | $ 3,956.5 | $ 4,378.2

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