Business and Organization - Revisions to Statements of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings	$ 132.9	$ 71.5	$ 156.1
Amortization of debt issuance costs	5.5	4.7	0.0
Loss on early extinguishment of debt	1.7	2.7	0.0
Deferred income taxes	(64.3)	(7.6)	(29.0)
Other current and long-term liabilities	6.3	29.4	(5.5)
Net cash provided by operating activities	137.8	124.3	143.0
Net transactions with MTW	0.0	(4.6)	(182.9)
Net cash used in financing activities	(51.7)	(81.2)	(183.1)
As Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings	134.0	79.5	157.1
Amortization of debt issuance costs	5.4	4.8
Loss on early extinguishment of debt	4.4	0.0
Deferred income taxes	(63.3)	(9.9)	(30.0)
Other current and long-term liabilities	1.6	27.8
Net cash provided by operating activities		125.8
Net transactions with MTW		(6.1)
Net cash used in financing activities		(82.7)
Computation of Income Tax Expense | Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net earnings	(1.1)	(8.0)	(1.0)
Amortization of debt issuance costs	0.1	(0.1)
Loss on early extinguishment of debt	(2.7)	2.7
Deferred income taxes	(1.0)	2.3	$ 1.0
Other current and long-term liabilities	$ 4.7	1.6
Net cash provided by operating activities		(1.5)
Net transactions with MTW		1.5
Net cash used in financing activities		$ 1.5