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Other Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Financial Instruments Subject to Mandatory Redemption by Settlement Terms      
Gain on asset acquisition     $ 7.7
Redeemable financial liability     174.8
Gain (Loss) Included in Earnings $ (73.3) $ (202.9)  
Other Current Liabilities      
Financial Instruments Subject to Mandatory Redemption by Settlement Terms      
Current portion of mandatorily redeemable financial liability     $ 33.7