CONSOLIDATED STATEMENT OF INCOME (Parenthetical) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Special charges	$ 13.0	$ 75.6	$ 12.1	$ 26.0	$ (51.6)	$ 4.9	$ 36.8	$ 6.2	$ 126.7	$ (3.7)	$ 39.5
Cost of sales
Special charges	5.8	$ 3.6	$ (0.1)		17.8	$ 0.3	$ 24.4	$ 1.5	9.3	44.0	66.0
Interest expense
Special charges	$ 0.3				$ 21.9				0.3	21.9
Product and sold equipment | Cost of sales
Special charges									$ 9.3	$ 44.0	$ 66.0