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Long-term Debt - Textual (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
May 31, 2017
USD ($)
shares
Feb. 29, 2016
Nov. 30, 2013
shares
Jun. 30, 2017
USD ($)
shares
Mar. 31, 2017
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
Feb. 25, 2016
renewal_option
Nov. 18, 2013
USD ($)
$ / shares
Debt Instrument [Line Items]                      
Debt Instrument, Face Amount                     $ 320.0
Temporary Equity, Repurchased during Period, Shares | shares     257,110                
Preferred Stock, Dividend Rate, Percentage     6.50%                
Preferred Stock, Par or Stated Value Per Share | $ / shares                     $ 0.10
Temporary Equity, Liquidation Preference Per Share | $ / shares                     $ 1,000
Debt Instrument, Convertible, Terms of Conversion Feature 27.2221 shares per $1,000 principal amount                    
Conversion of convertible debt $ 319.4           $ 319.4 $ 0.0      
Conversion of convertible debt, net of tax (shares) | shares 8,900,000                    
Stock Issued During Period, Shares, Conversion of Convertible Securities Due to Make-Whole Premium | shares 200,000                    
Convertible senior subordinated notes (shares) | shares       7,500,000 8,600,000 8,500,000 8,100,000 8,500,000      
Repayments of Debt $ 0.6                    
Loss on early extinguishment of debt       $ 10.4   $ 2.4 $ 10.4 $ 4.8      
Noncurrent financing obligation liability       275.7     275.7   $ 279.3    
Development / Lease Agreement [Member]                      
Debt Instrument [Line Items]                      
Initial lease term   15 years                  
Number of renewal options | renewal_option                   4  
Renewal term   5 years                  
Increase in property plant and equipment, net             40.2   20.3    
Development / Lease Agreement [Member] | Financing Obligation [Member]                      
Debt Instrument [Line Items]                      
Total estimated financing obligation       56.0     56.0        
Other Notes Payable [Member] | Development / Lease Agreement [Member]                      
Debt Instrument [Line Items]                      
Noncurrent financing obligation liability       40.1     40.1   $ 20.3    
Capital Lease Obligations, Current       $ 0.1     $ 0.1