Long-term Equity-based Compensation Plans Disclosure of Share-based Compensation Arrangements by Share-based Payment Awards (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Options and Stock Appreciation Rights, Outstanding at Beginning of the Year, Number	3,192,054
Options and Stock Appreciation Rights, Outstanding at Beginning of the Year, Weighted Average Exercise Price	$ 40.53
Options and Stock Appreciation Rights, Grants in Period, Gross	283,750
Options and Stock Appreciation Rights, Grants in Period, Weighted Average Exercise Price	$ 33.20
Options and Stock Appreciation Rights, Exercises in Period	(74,500)
Options and Stock Appreciation Rights, Exercises in Period, Weighted Average Exercise Price	$ 26.29
Options and Stock Appreciation Rights, Forfeitures and Expirations in Period	(473,756)
Options and Stock Appreciation Rights, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 42.47
Options and Stock Appreciation Rights, Outstanding at End of the Year, Number	2,927,548
Options and Stock Appreciation Rights, Outstanding at End of the Year, Weighted Average Exercise Price	$ 39.86
Options and Stock Appreciation Rights, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 2 months 12 days
Options and Stock Appreciation Rights, Outstanding at End of Period, Intrinsic Value	$ 6.0
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Number	2,884,537
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Weighted Average Exercise Price	$ 40.01
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Weighted Average Remaining Contractual Term	4 years 1 month 20 days
Options and Stock Appreciation Rights, Vested and Expected to Vest, Outstanding at End of Period, Aggregate Intrinsic Value	5.9
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Number	2,387,983
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Weighted Average Exercise Price	$ 42.04
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Weighted Average Remaining Contractual Term	3 years 2 months 16 days
Options and Stock Appreciation Rights, Vested and Expected to Vest, Exercisable at End of Period, Aggregate Intrinsic Value	3.9
Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 10.20	$ 9.39
Options, Exercises in Period, Total Intrinsic Value	0.4	0.1
Tax Benefit from Stock Options Exercised	0.2	0
Cash Exercise of Stock Options	$ 0.1	$ 0