Stock-Based Incentive Plan (Narrative) (Details) (Long-Term Incentive Plan 2003, USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares reserved for issuance to employees	55,300,000
Total unrecognized compensation expense, net of estimated forfeitures	$ 74.6
Weighted-average period over which total unrecognized compensation expense expected to be recognized, in years	1 year 8 months 13 days
Intrinsic value of stock-based awards exercised and restricted stock units converted	70.4	45.8
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award expiration period, in years	10 years
Average remaining contractual term for options outstanding, in years	6 years 7 months 20 days
Average remaining contractual term for options vested and expected to vest, in years	6 years 6 months 10 days
Average remaining contractual term for options exercisable, in years	5 years 5 months 0 days
Aggregate intrinsic value for options outstanding	245.8
Aggregate intrinsic value for options vested and expected to vest	235.2
Aggregate intrinsic value for options exercisable	$ 174.7
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period, in years	3 years
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option award vesting period, in years	4 years