Income Taxes (Details 3) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Deferred tax liabilities:
Depreciation, depletion, and amortization	$ 919.6	$ 711.6
Partially-owned subsidiaries basis difference	171.5	144.0
Convertible debt	137.4	125.2
Total deferred tax liabilities	1,228.5	980.8
Deferred tax assets:
Workers compensation, pensions, and other benefits	46.7	73.7
Warranties and reserves	12.1	11.4
Equity items	52.6	52.4
Tax loss carryforwards and credits	24.9	25.7
Inventory	29.2	34.1
Accrued liabilities and other	6.5	8.3
Total deferred tax assets	172.0	205.6
Net deferred tax liabilities before valuation allowances	1,056.5	775.2
Valuation allowances	11.7	10.1
Net deferred tax liabilities before reserve for uncertain tax positions	1,068.2	785.3
Deferred tax assets included in reserve for uncertain tax positions	(11.2)	(50.5)
Adjusted net deferred tax liabilities	$ 1,057.0	$ 734.8