Equity-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2011 Performance Stock Shares [Member]		Oct. 01, 2010 Performance Stock Shares [Member]	Sep. 30, 2011 Restricted Stock [Member]	Oct. 01, 2010 Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based grants vesting period in years, minimum		one
Equity-based grants vesting period in years, maximum		four
Vesting period for a majority of equity-based compensation awards granted in years		three
Number of shares for equity-based compensation grants approved by shareholders	53,889,977	53,889,977
Number of shares for equity-based compensation approved by shareholders available for grant	19,664,129	19,664,129
Contractual term of stock options and stock appreciation rights, years		10
Aggregate intrinsic value of exercised stock options	$ 0.3
Unrecognized equity-based compensation cost	34.2	34.2
Weighted average period for equity-based compensation recognition, years		1.8
Weighted average fair value of stock options granted		$ 2.03
Fair market value of restricted stock vested						11.1
Shares issued for each PSU granted, maximum		2
Weighted average grant date fair value			$ 5.57	[1]		$ 5.32	$ 8.73
Performance stock units granted			1,654,965		1,140,333
Weighted average fair value of performance stock units granted during period			$ 5.39		$ 7.73
Results of 2010 operating earnings strategic goal target			$ 237.0
Additional shares granted during period, percentage		25.00%
Additional shares granted for performance stock units for performance greater than 100 percent of targets			183,737
Percentage of performance stock units earned			125.00%
Shares earned per performance stock unit			1.25
Number of common shares vested and issued for performance stock units granted in 2010			306,155

[1] This includes the additional 183,737 shares from the 2010 grant that were earned based on 2010 operating earnings and strategic goals.