Summary of Significant Accounting Policies and Basis of Presentation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to cash and cash equivalents balance	$ 103.9		$ 103.9		$ 128.4
Increase (decrease) to cash flows provided by investing activities			52.1	$ 255.1
Decrease in cash flow from operating activities			$ (288.0)	(254.0)
Standard product warranty, low end of range (in months)			12 months
Standard product warranty, high end of range (in months)			60 months
Deferred revenue expected to be recognized	3.6		$ 3.6		4.2
Pension Plans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic (benefit) cost	0.5	$ 0.3	0.9	0.6
Postretirement Health and Other Plans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic (benefit) cost	0.2	0.0	0.3	0.1
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase to cash and cash equivalents balance		0.4		0.4		$ 6.4
Increase (decrease) to cash flows provided by investing activities				(6.1)
Accounting Standards Update 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) to cash flows provided by investing activities				115.9
Decrease in cash flow from operating activities				257.4
Selling, General and Administrative Expenses | Accounting Standard Update 2017-07 | Pension Plans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic (benefit) cost		(0.4)		(0.7)
Other Expense | Accounting Standard Update 2017-07 | Pension Plans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic (benefit) cost	0.5	$ 0.4		$ 0.7
Other Expense | Accounting Standard Update 2017-07 | Postretirement Health and Other Plans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net periodic (benefit) cost	0.2
Extended Warranties
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue expected to be recognized	6.3		6.3		$ 6.7
Deferred revenue recognized	0.4		0.8
Performance Obligations not Yet Met
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred revenue expected to be recognized	$ 1.0		$ 1.0