Income Taxes Deferred Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred Tax Assets:
Allowance for doubtful accounts	$ 22.0	$ 28.5
Inventories	31.3	33.0
Pension benefits	41.2	49.1
Environmental and regulatory compliance	17.7	18.9
Other accruals and prepayments	35.2	44.2
Deferred service income	14.5	10.5
Warranty services	29.0	27.1
Stock compensation expense	36.4	31.7
Tax credit and loss carryforwards	61.4	74.0
Other	7.3	8.0
Valuation allowance	(27.7)	(26.7)
Total deferred tax assets	268.3	298.3
Deferred Tax Liabilities:
Property, plant and equipment	(79.9)	(33.2)
Insurance, including self-insurance	(138.7)	(85.2)
Goodwill and other intangibles	(607.6)	(416.5)
Other	(20.0)	(10.0)
Total deferred tax liabilities	(846.2)	(544.9)
Provisional estimate of the deferred tax asset revaluation	(54.5)	0.0
Provisional estimate of the deferred tax liability revaluation	274.0	0.0
Net deferred tax liabilities	$ (358.4)	$ (246.6)