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Other Liabilities (Details) $ in Millions	12 Months Ended
Other Liabilities (Details) $ in Millions	Dec. 31, 2016 USD ($)
Financial Instruments Subject to Mandatory Redemption by Settlement Terms
Gain on asset acquisition	$ 72.6
Redeemable financial liability	176.0
Other Current Liabilities
Financial Instruments Subject to Mandatory Redemption by Settlement Terms
Current portion of mandatorily redeemable financial liability	$ 33.7