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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Income Tax Contingency [Line Items]          
U.S. statutory rate (as a percent)       35.00%  
Income Tax Expense (Benefit) $ (6.0)   $ (2.2) $ (15.7) $ 2.4
Effective Income Tax Rate Reconciliation, Percent     43.10%    
Equity in earnings of unconsolidated affiliates, net of tax 0.0   $ 6.8 0.0 $ 14.1
Tax Year 2012 [Member]          
Income Tax Contingency [Line Items]          
Operating Loss Carryforwards 1.7     1.7  
Tax Assessment Year 2010 to 2012 [Member]          
Income Tax Contingency [Line Items]          
Income Tax Expense (Benefit) $ 3.5        
Tax Assessment Year 2007 to 2009 [Member]          
Income Tax Contingency [Line Items]          
Income Tax Expense (Benefit)   $ 12.8   $ 12.8