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Stock-Based Compensation Stock-based Compensation (Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock or Unit Option Plan Expense	$ 1.1	$ 4.3	$ 12.5
Restricted Stock or Unit Expense	36.1	28.6	30.5
Allocated Share-based Compensation Expense	37.2	32.9	43.0
Allocated Share-based Compensation Expense, Net of Tax	23.9	21.2	31.8
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 13.3	$ 11.7	$ 11.2

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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