Service Alignment Initiative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		18 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Balance at June 30, 2017			$ 74.4
Charged to expense	$ 3.3	$ 1.2	10.8
Restructuring Reserve, Accrual Adjustment			(10.8)
Restructuring Charges, Net of Reversals			0.0	$ 41.1
Restructuring and Related Cost, Incurred Cost					$ 90.0
Cash payments			(20.2)
Non-cash utilization			(0.6)
Balance at December 31, 2017	53.6		53.6		53.6
Employee separation benefits
Restructuring Reserve [Roll Forward]
Balance at June 30, 2017			73.9
Charged to expense	2.3	0.0	7.9
Restructuring Reserve, Accrual Adjustment			(10.8)
Restructuring Charges, Net of Reversals			(2.9)	37.3
Restructuring and Related Cost, Incurred Cost					81.2
Cash payments			(18.0)
Non-cash utilization			0.0
Balance at December 31, 2017	53.0		53.0		53.0
Other initiative costs
Restructuring Reserve [Roll Forward]
Balance at June 30, 2017			0.5
Charged to expense	1.0	$ 1.2	2.9	$ 3.8
Restructuring Reserve, Accrual Adjustment			0.0
Restructuring and Related Cost, Incurred Cost					8.8
Cash payments			(2.2)
Non-cash utilization			(0.6)
Balance at December 31, 2017	0.6		0.6		0.6
Maximum
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 25.0		$ 25.0		$ 25.0