Income Taxes (Details 3) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax liabilities:
Depreciation, depletion, and amortization	$ 711.6	$ 627.1
Partially-owned subsidiaries basis difference	144.0	101.9
Convertible debt	125.2	114.8
Total deferred tax liabilities	980.8	843.8
Deferred tax assets:
Workers compensation, pensions, and other benefits	73.7	68.6
Warranties and reserves	11.4	12.3
Equity items	52.4	53.3
Tax loss carryforwards and credits	25.7	25.1
Inventory	34.1	29.2
Accrued liabilities and other	8.3	4.3
Total deferred tax assets	205.6	192.8
Net deferred tax liabilities before valuation allowances	775.2	651.0
Valuation allowances	10.1	9.6
Net deferred tax liabilities before reserve for uncertain tax positions	785.3	660.6
Deferred tax assets included in reserve for uncertain tax positions	(50.5)	(45.6)
Adjusted net deferred tax liabilities	$ 734.8	$ 615.0