Debt - Maturities of outstanding debt (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Debt Disclosure [Abstract]
2016	$ 251.1
2017	240.8
2018	598.8
2019	29.0
2020	29.0
2021 and thereafter	2,749.6
Total external and related party debt	$ 3,898.3	$ 3,650.4

Debt, Long-term and Short-term, Combined Amount, Including Related Party Debt

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Due to Related Parties, Maturities, Repayments of Principal after Year Five

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Due to Related Parties, Maturities, Repayments of Principal in Next Twelve Months

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Due to Related Parties, Maturities, Repayments of Principal in Year Five

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Due to Related Parties, Maturities, Repayments of Principal in Year Four

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Due to Related Parties, Maturities, Repayments of Principal in Year Three

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Due to Related Parties, Maturities, Repayments of Principal in Year Two

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