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Income Taxes - Effective Inccome Tax Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount      
Federal statutory tax rate $ 61.2 $ 30.5 $ 47.8
Federal statutory tax rate 2.4 2.8 4.9
State and local income taxes, net of federal benefit 0.5 0.8 (0.4)
Foreign income tax rate differential 1.7 13.2 1.5
Domestic manufacturing deduction (5.1) (4.0) (3.0)
Noncontrolling interest in consolidated partnership (6.6) (3.1) (1.9)
Nondeductible separation costs 0.0 1.5 2.4
Other 0.0 2.2 0.0
Federal and state tax credits (0.7) (0.6) (0.3)
Deferred rate change (0.4) (0.6) 0.0
U.S. Tax Reform (24.5) 0.0 0.0
Other 1.1 (0.1) 1.2
Provision (benefit) for income taxes $ 29.6 $ 42.6 $ 52.2
Effective tax rate 16.90% 49.00% 38.20%