Stock-Based Compensation Outstanding Options and SSARs (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Options / SSARs outstanding at January 1, 2014	7,004,000
Incentive shares granted	379,000
Options / SSARs exercised	(107,000)
Options / SSARs canceled	(267,000)
Options / SSARs outstanding at September 30, 2014	7,009,000
Options / SSARs outstanding Weighted Average Exercise Price	$ 14.17	$ 14.19
Options / SSARs granted Weighted Average Exercise Price	$ 17.04
Options / SSARs exercised Weighted Average Exercise Price	$ 11.37
Options / SSARs canceled Weighted Average Exercise Price	$ 26.50
Options / SSARs outstanding Weighted Average Contractual Term (in years)	4 years 8 months 12 days
Options / SSARs outstanding Aggregate Intrinsic Value (in millions)	$ 31.8
Vested and expected to vest	6,658,000
Vested and expected to vest Aggregate Intrinsic Value (in millions)	30.2
Options / SSARs exercisable	6,204,000
Options / SSARs exercisable Weighted Average Exercise Price	$ 13.44
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	4 years 1 month 6 days
Options / SSARs exercisable Aggregate Intrinsic Value (in millions)	31.6
Options and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Weighted-average period of years costs are expected to be recognied over	1 year 10 months 24 days
Compensation Expense	0.9
Unrecognized compensation costs	$ 6.7
Number of Shares Available for Grant	3,900,000
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Vesting Period	3 years