Revenue from Contract with Customer - Impact of Changes in Accounting Policy (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
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Trade receivables, net	$ 809.3		$ 809.3		$ 830.1
Total inventories	820.9		820.9		737.0
Deferred revenue	416.1		416.1		437.5
Deferred income taxes	255.4		255.4		287.1
Retained earnings	215.8		215.8		$ 399.0
Total net sales	1,105.6	$ 1,133.9	2,169.8	$ 2,236.7
Cost of sales	(885.9)	(896.1)	(1,709.2)	(1,756.4)
Net income (loss)	(133.4)	$ (23.6)	(196.7)	$ (75.8)
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	(6.8)		(6.8)
Total inventories	18.8		18.8
Deferred revenue	23.6		23.6
Deferred income taxes	(2.8)		(2.8)
Retained earnings	(8.8)		(8.8)
Total net sales	(14.7)		0.0
Cost of sales	8.2		0.0
Net income (loss)	0.0		0.0
Calculated under Revenue Guidance in Effect before Topic 606 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Trade receivables, net	802.5		802.5
Total inventories	839.7		839.7
Deferred revenue	439.7		439.7
Deferred income taxes	252.6		252.6
Retained earnings	$ 207.0		$ 207.0