Stock-Based Compensation (Summary Of Performance Share Unit Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued	172,231
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value	$ 5.9
Performance Share Units Member
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	$ 23.3
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 8 months
Outstanding at January 1, 2014 (non-vested)	983,610
Granted	23,964
Vesting and transfer of ownership to recipients	(181,290)
Forfeited	(87,564)
Outstanding at March 31, 2014 (non-vested)	738,720
Percentage Of Share Units Awarded Ultimately Issued	95.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 40.53
Performance Share Units Member | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Expense	3 years
Percentage Of Share Units Awarded Ultimately Issued	200.00%
Current Estimated Percentage Of Share Units Awarded Ultimately Issued	165.00%
Performance Share Units Member | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Share Units Awarded Ultimately Issued	0.00%
Current Estimated Percentage Of Share Units Awarded Ultimately Issued	120.00%