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Stockholders' Equity (Noncontrolling Interests) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 6 Months Ended
Mar. 31, 2014
JointVenture
Jun. 30, 2014
JointVenture
Dec. 31, 2013
Noncontrolling Interest [Line Items]      
Noncontrolling interests   $ 1,818.2 $ 50.6
Noncontrolling Interest, Increase from Subsidiary Equity Issuance   8.6  
Number of Joint Venture Investments Consolidated 6 7  
Consolidation of noncontrolling interests (Note 4)   291.8  
KWE [Member]
     
Noncontrolling Interest [Line Items]      
Ownership percentage by parent   13.20%  
Noncontrolling Interest, Increase from Subsidiary Equity Issuance   1,409.5  
Noncontrolling Interest [Member]
     
Noncontrolling Interest [Line Items]      
Noncontrolling interests   1,818.2 50.6
Noncontrolling Interest, Increase from Subsidiary Equity Issuance   8.6  
Consolidation of noncontrolling interests (Note 4)   291.8  
Noncontrolling Interest [Member] | KWE [Member]
     
Noncontrolling Interest [Line Items]      
Noncontrolling Interest, Increase from Subsidiary Equity Issuance   1,416.0  
Additional Paid-in Capital [Member] | KWE [Member]
     
Noncontrolling Interest [Line Items]      
Noncontrolling Interest, Increase from Subsidiary Equity Issuance   $ (6.5)