Share-Based Compensation And Capital Stock Unrecognized Compensation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 11.2	$ 8.9	$ 9.0
Compensation Cost Not yet Recognized		16.5
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	2.8	2.4	2.8
Compensation Cost Not yet Recognized		3.3
Total Compensation Cost Not yet Recognized, Period for Recognition		2.2
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	7.7	6.8	6.4
Compensation Cost Not yet Recognized		12.3
Total Compensation Cost Not yet Recognized, Period for Recognition		2.4
Performance Vested Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	0.7	(0.3)	(0.2)
Compensation Cost Not yet Recognized		0.9
Total Compensation Cost Not yet Recognized, Period for Recognition		1.7
Acceleration Of Award Vesting Conditions [Member] | Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	0.2		0.5
Acceleration Of Award Vesting Conditions [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 0.5		$ 0.2