Annual report pursuant to Section 13 and 15(d)

Income Taxes, Income Tax Reconciliation and Allocation of Income Tax Provision (Details)

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Income Taxes, Income Tax Reconciliation and Allocation of Income Tax Provision (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Possible decrease in unrecognized tax benefits in 2015 $ 1.9    
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Income tax provision at 35 percent 110.3 $ 100.7 $ 73.1
State and local income taxes, net of Federal income tax effect 7.3 6.4 2.5
Deferred tax asset valuation allowance 5.3 (7.6) (595.2)
Income attributable to domestic production activities (9.2) (8.8) (3.8)
Impairment of equity method investment 0.0 4.0 0.0
Change in estimates related to prior years and prior years amended tax return filings (4.2) (1.4) 3.3
Federal and state tax credits (8.9) (7.6) (14.7)
Taxes related to foreign income, net of credits (6.7) 5.2 2.3
Taxes related to unremitted earnings (11.4) (5.5) (5.3)
Tax reserve reassessment 0.6 (0.3) (12.8)
Deferred tax reassessment 3.0 3.5 (1.6)
Other 1.7 4.4 4.3
Income tax provision (benefit) $ 87.8 $ 93.0 $ (547.9)
Effective tax rate 27.90% 32.30%  
Federal statutory tax rate 35.00% 35.00% 35.00%
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]      
Continuing operations $ 87.8 $ 93.0 $ (547.9)
Discontinued operations 0.3 11.0 (0.1)
Total tax provision (benefit) $ 88.1 $ 104.0 $ (548.0)