Revenue from Contract with Customer - Impact of Changes in Accounting Policy (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Trade receivables, net	$ 818.1		$ 818.1		$ 830.1
Inventories	846.5		846.5		728.9
Deferred revenue	365.3		365.3		437.5
Deferred income taxes	240.7		240.7		287.1
Retained earnings (accumulated deficit)	(3.2)		(3.2)		$ 393.6
Total net sales	(1,119.0)	$ (1,122.7)	(3,288.8)	$ (3,359.4)
Cost of sales	(890.7)	(882.7)	(2,601.1)	(2,641.1)
Net income (loss)	(218.7)	$ (29.4)	(416.6)	$ (106.5)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Trade receivables, net	(5.4)		(5.4)
Inventories	25.2		25.2
Deferred revenue	30.1		30.1
Deferred income taxes	(0.9)		(0.9)
Retained earnings (accumulated deficit)	(9.4)		(9.4)
Total net sales	5.2		19.0
Cost of sales	6.5		15.1
Net income (loss)	0.9		(2.7)
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Trade receivables, net	812.7		812.7
Inventories	871.7		871.7
Deferred revenue	395.4		395.4
Deferred income taxes	239.8		239.8
Retained earnings (accumulated deficit)	$ (12.6)		$ (12.6)