Mezzanine Equity (Sensitivity Analysis Of Fair Value Of Redeemable Noncontrolling Interests Using Discount And Terminal Growth Rates) (Details) $ in Millions	Dec. 31, 2015 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal growth rate assumed in determining fair value	2.00%
Rate 1.75% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal growth rate assumed in determining fair value	1.75%
Rate 2.25% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Terminal growth rate assumed in determining fair value	2.25%
Discount Rate 0% [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount growth rate assumed in determining fair value	12.25%
Discount Rate 0% [Member] | Rate 1.75% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 191.2
Discount Rate 0% [Member] | Rate 2.00% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	192.6
Discount Rate 0% [Member] | Rate 2.25% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 194.1
Discount Rate 0% [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount growth rate assumed in determining fair value	12.50%
Discount Rate 0% [Member] | Rate 1.75% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 188.1
Discount Rate 0% [Member] | Rate 2.00% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	189.4
Discount Rate 0% [Member] | Rate 2.25% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 190.7
Discount Rate 0% [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount growth rate assumed in determining fair value	12.75%
Discount Rate 0% [Member] | Rate 1.75% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 185.0
Discount Rate 0% [Member] | Rate 2.00% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	186.3
Discount Rate 0% [Member] | Rate 2.25% Terminal Growth Rates [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of redeemable noncontrolling interests	$ 187.6