Income Taxes (Reconciliation Between Federal Statutory Tax Rate and Effective Tax Rates) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Rate reconciliation
Tax at statutory rate	$ 25.1	$ 21.1	$ 19.3
Effect of state income taxes, net	1.4	1.1	0.9
Effect of foreign operations	(0.9)	(0.2)	(0.1)
Valuation allowance	(1.1)	(1.6)	(0.2)
Non-deductible items	1.8	0.7	0.6
Manufacturer's deduction	(1.4)	(1.4)	(0.6)
Other, net	0	(0.3)	0.4
Income tax expense	$ 24.9us-gaap_IncomeTaxExpenseBenefit	$ 19.4us-gaap_IncomeTaxExpenseBenefit	$ 20.3us-gaap_IncomeTaxExpenseBenefit

Income tax reconciliation gain on asset purchase.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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