Stock-Based Compensation Outstanding Options and SSARs (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	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 beginning of period				7,004
Incentive shares granted				379
Options / SSARs exercised				(1,141)
Options / SSARs canceled				(307)
Options / SSARs outstanding at end of period		5,935		5,935
Options / SSARs outstanding Weighted Average Exercise Price		$ 14.29		$ 14.29		$ 14.19
Options / SSARs granted Weighted Average Exercise Price		17.04		17.04
Options / SSARs exercised Weighted Average Exercise Price		11.45		11.45
Options / SSARs canceled Weighted Average Exercise Price		$ 25.83		$ 25.83
Options / SSARs outstanding Weighted Average Contractual Term (in years)				4 years 6 months
Options / SSARs outstanding Aggregate Intrinsic Value (in millions)		$ 19.5		$ 19.5
Vested and expected to vest	[1]	5,638		5,638
Vested and expected to vest Aggregate Intrinsic Value (in millions)	[1]	$ 18.5		$ 18.5
Options / SSARs exercisable		5,183		5,183
Options / SSARs exercisable Weighted Average Exercise Price		$ 13.78		$ 13.78
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term				3 years 9 months 18 days
Options / SSARs exercisable Aggregate Intrinsic Value (in millions)		$ 19.5		$ 19.5
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 6 months
Compensation Expense		0.8	$ 0.9	$ 2.7	$ 2.8
Unrecognized compensation costs		$ 4.7		$ 4.7
Number of Shares Available for Grant		3,900		3,900
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

[1] Options and SSARS expected to vest based upon historical forfeiture rate