Other Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Asset Acquisition, gain recognized		$ 7.7
Redeemable financial liability		174.8
Less: Gains (losses) recognized in interest expense	$ (293.7)
Other Current Liabilities
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Financial instruments subject to mandatory redemption, dividends owed to noncontrolling interest, current portion		$ 33.7