Income Taxes, Income Tax Reconciliation and Allocation of Income Tax Provision (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Possible decrease in unrecognized tax benefits in 2015	$ 0.3
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income tax provision at 35 percent	100.7	73.1	54.6
State and local income taxes, net of Federal income tax effect	6.4	2.5	(0.6)
Deferred tax asset valuation allowance	(7.6)	(595.2)	(25.0)
Income attributable to domestic production activities	(8.8)	(3.8)	(2.8)
Impairment of equity method investment	4.0	0	0
Change in estimates related to prior years and prior years amended tax return filings	(1.4)	3.3	(1.8)
Federal and state tax credits	(7.6)	(14.7)	(0.3)
Taxes related to foreign income, net of credits	5.2	2.3	6.6
Taxes related to unremitted earnings	(5.5)	(5.3)	(3.4)
Tax reserve reassessment	(0.3)	(12.8)	3.7
Deferred tax reassessment	3.5	(1.6)	(0.6)
Other	4.4	4.3	1.0
Income tax provision (benefit)	93.0us-gaap_IncomeTaxExpenseBenefit	(547.9)us-gaap_IncomeTaxExpenseBenefit	31.4us-gaap_IncomeTaxExpenseBenefit
Effective tax rate	32.30%		20.10%
Federal statutory tax rate	35.00%	35.00%	35.00%
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]
Continuing operations	93.0us-gaap_IncomeTaxExpenseBenefit	(547.9)us-gaap_IncomeTaxExpenseBenefit	31.4us-gaap_IncomeTaxExpenseBenefit
Discontinued operations	11.0	(0.1)	2.9
Total tax provision (benefit)	$ 104.0	$ (548.0)	$ 34.3

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Income attributable to domestic production activities

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to the Company's change in assertion that undistributed earnings at certain subsidiaries would no longer be designated as permanently reinvested offset with taxes related to unremitted earnings.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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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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The sum of income tax expense or benefit for the period that has been allocated among continuing operations, discontinued operations, extraordinary items, other comprehensive income, and items charged or credited directly to shareholders' equity.

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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 the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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