Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued expenses	$ 43.0	$ 74.5
Warranty accrual	13.5	19.7
Deferred compensation	10.6	16.2
Allowances for doubtful accounts	3.8	10.3
Inventories	14.4	26.1
Deferred revenue	38.1	19.1
Pensions, post-retirement and other benefits	82.6	92.3
Tax credits	81.9	52.1
Net operating loss carryforwards	125.9	88.4
Capital loss carryforwards	2.6	1.8
State deferred taxes	17.4	17.1
Other	0.8	0.5
Deferred Tax Assets, Gross	434.6	418.1
Valuation allowance	(105.6)	(87.8)
Net deferred tax assets	329.0	330.3
Deferred tax liabilities
Property, plant and equipment, net	1.2	39.7
Goodwill and intangible assets	302.8	271.5
Partnership interest	0.0	3.7
Undistributed earnings	16.0	6.5
Other	2.3	0.0
Net deferred tax liabilities	322.3	321.4
Net deferred tax asset	$ 6.7	$ 8.9