XML 70 R49.htm IDEA: XBRL DOCUMENT v3.6.0.2
Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current Assets and Current Liabilities [Abstract]      
Threshold for components of total current assets and current liabilities to be presented as an individual caption on Consolidated Balance Sheet 5.00%    
Environmental Costs [Abstract]      
Environmental reserves - current portion $ 5.6 $ 5.8  
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash 354.5 15.9  
Increase in restricted cash $ 338.6 15.9 $ (65.6)
Minimum [Member]      
Derivative Instruments [Abstract]      
Expected offset percentage of change in fair value derivative instrument 80.00%    
Maximum [Member]      
Derivative Instruments [Abstract]      
Expected offset percentage of change in fair value derivative instrument 125.00%    
Allowance for Doubtful Accounts [Member]      
Movement in valuation allowances and reserves [Roll Forward]      
Balance at beginning of period $ 12.1 13.9 7.5
Charged to costs and expenses 2.3 0.8 8.4
Deductions (3.1) (2.6) (2.0)
Balance at end of period 11.3 12.1 13.9
Environmental Reserves [Member]      
Movement in valuation allowances and reserves [Roll Forward]      
Balance at beginning of period 13.0 15.6 9.9
Charged to costs and expenses 7.0 6.4 11.9
Acquisition-related additions and other 0.5 1.1 2.5
Deductions (8.6) (10.1) (8.7)
Balance at end of period $ 11.9 $ 13.0 $ 15.6
Minor Investment [Member] | Minimum [Member]      
Consolidation Policy [Abstract]      
Equity method of ownership interest 3.00%    
Minor Investment [Member] | Maximum [Member]      
Consolidation Policy [Abstract]      
Equity method of ownership interest 50.00%    
Major Investment [Member] | Minimum [Member]      
Consolidation Policy [Abstract]      
Equity method of ownership interest 20.00%    
Major Investment [Member] | Maximum [Member]      
Consolidation Policy [Abstract]      
Equity method of ownership interest 50.00%    
Initial Margin Requirement [Member]      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash $ 35.6    
Variation Margin Requirement [Member]      
Restricted Cash and Cash Equivalents Items [Line Items]      
Restricted cash 318.9    
Increase in restricted cash $ 339.3