Income Taxes - Deferred Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets:
Allowance for doubtful accounts	$ 17.4	$ 22.0
Inventories	17.9	25.7
Pension benefits	27.3	37.1
Environmental and regulatory compliance	10.1	16.6
Other accruals and prepayments	50.5	31.2
Deferred service income	7.1	14.5
Warranty services	19.7	27.5
Stock compensation expense	14.2	20.9
Tax credit and loss carryforwards	131.4	67.8
Valuation allowances	(40.3)	(26.2)
Total deferred tax assets	255.3	237.1
Deferred Tax Liabilities:
Property, plant and equipment	(11.7)	(73.2)
Insurance, including self-insurance	(155.2)	(140.0)
Goodwill and other intangibles	(597.1)	(526.4)
Other	(14.7)	(11.2)
Total deferred tax liabilities	(778.7)	(750.8)
Provisional estimate of the deferred tax asset revaluation	0.0	(51.4)
Provisional estimate of the deferred tax liability revaluation	0.0	247.6
Net deferred tax liability	$ (523.4)	$ (317.5)