Exercise price of the option.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to all stock-based compensation plans	$ 9.3	$ 9.4	$ 8.8
Allocated Share-based Compensation Expense	0.5
Proceeds from Issuance of Common Stock	0.7	0.0	0.1
Payments Related to Tax Withholding for Share-based Compensation	$ 6.1	$ 1.5	$ 12.1
Phantom Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	66,339
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period of years costs are expected to be recognied over	1 year 2 months 19 days
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	282,701	453,146	512,085	625,049
Allocated Share-based Compensation Expense	$ 1.7	$ 2.1	$ 2.1
Chief Executive Officer [Member] \| Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 0.1
Weighted-average period of years costs are expected to be recognied over	5 months
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	300,000
Allocated Share-based Compensation Expense	$ 0.4
Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Investment Options, Exercise Price	$ 100