Stock-Based Compensation Outstanding Options and SSARs (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term		$ 200,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance		7,004	6,937	8,475
Options / SSARs granted		378	494	343
Options / SSARs exercised		(1,334)	(43)	(1,861)
Options / SSARs cancelled		(309)	(384)	(20)
Ending balance		5,739	7,004	6,937
Options / SSARs outstanding Weighted Average Exercise Price		$ 14.54	$ 14.19	$ 14.26	$ 12.88
SSARs granted Weighted Average Exercise Price		17.04	18.09	20.49
Options / SSARs exercised Weighted Average Exercise Price		10.76	9.92	9.06
Options / SSARs cancelled Weighted Average Exercise Price		$ 25.83	$ 21.14	$ 22.23
Options / SSARs outstanding Weighted Average Contractual Term (in years)		4 years 2 months 12 days
Options / SSARs outstanding Aggregate Intrinsic Value (in millions)		$ 29.8
Vested and expected to vest	[1]	5,714
Vested and expected to vest Aggregate Intrinsic Value (in millions)	[1]	$ 29.8
Options / SSARs exercisable		4,987
Share Based Compensation Arrangement by Share Based Payment Award, Options And Ssars, Exercisable, Weighted Average Exercise Price		$ 14.04
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term		3 years 6 months 22 days
Options / SSARs exercisable Aggregate Intrinsic Value (in millions)		$ 29.5
Allocated Share-based Compensation Expense		$ 0.5
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Weighted-average period of years costs are expected to be recognied over		1 year 2 months 12 days
Allocated Share-based Compensation Expense		$ 3.5	$ 3.0	$ 2.7
Unrecognized compensation costs		4.2
Options and Ssars [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Allocated Share-based Compensation Expense		3.6	$ 3.8	$ 3.4
Unrecognized compensation costs		$ 3.7
Shares available under stock award plans		4,200
Options and Ssars [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Weighted-average period of years costs are expected to be recognied over		1 year 3 months 7 days

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