XML 62 R48.htm IDEA: XBRL DOCUMENT v3.8.0.1
Fair Value Measurements - Table 1 (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Market Approach Valuation Technique [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Current portion of restricted marketable securities $ 18.5 $ 24.2
Noncurrent portion of restricted marketable securities 41.4 33.5
Market Approach Valuation Technique [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Current portion of restricted marketable securities 0.0 0.0
Noncurrent portion of restricted marketable securities 0.0 0.0
Market Approach Valuation Technique [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Current portion of restricted marketable securities 18.5 24.2
Noncurrent portion of restricted marketable securities 41.4 33.5
Market Approach Valuation Technique [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Current portion of restricted marketable securities 0.0 0.0
Noncurrent portion of restricted marketable securities 0.0 0.0
Income Approach Valuation Technique [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Redeemable noncontrolling interests 221.3 138.3
Income Approach Valuation Technique [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Redeemable noncontrolling interests 0.0 0.0
Income Approach Valuation Technique [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Redeemable noncontrolling interests 0.0 0.0
Income Approach Valuation Technique [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]    
Redeemable noncontrolling interests $ 221.3 $ 138.3