Summary Of Significant Accounting Policies (Summary Of Net Revenue Disaggregated By Product And Region) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
U.S., Canada And Latin America [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 421.7	$ 367.9	$ 795.7	$ 702.6
U.S., Canada And Latin America [Member] | Devices [Member]
Disaggregation of Revenue [Line Items]
Net revenue	186.5	173.7	358.9	331.6
U.S., Canada And Latin America [Member] | Masks And Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	172.0	155.5	326.1	294.2
U.S., Canada And Latin America [Member] | Total Sleep And Respiratory Care [Member]
Disaggregation of Revenue [Line Items]
Net revenue	358.5	329.2	685.0	625.8
U.S., Canada And Latin America [Member] | Software As A Service [Member]
Disaggregation of Revenue [Line Items]
Net revenue	63.2	38.7	110.7	76.8
Combined Europe, Asia And Other Markets [Member] | Devices [Member]
Disaggregation of Revenue [Line Items]
Net revenue	156.2	163.3	307.9	291.6
Combined Europe, Asia And Other Markets [Member] | Masks And Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	73.2	70.1	135.8	130.7
Combined Europe, Asia And Other Markets [Member] | Total Sleep And Respiratory Care [Member]
Disaggregation of Revenue [Line Items]
Net revenue	229.4	233.4	443.7	422.3
Global [Member]
Disaggregation of Revenue [Line Items]
Net revenue	651.1	601.3	1,239.4	1,124.9
Global [Member] | Devices [Member]
Disaggregation of Revenue [Line Items]
Net revenue	342.7	337.0	666.8	623.2
Global [Member] | Masks And Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	245.2	225.6	461.9	424.9
Global [Member] | Total Sleep And Respiratory Care [Member]
Disaggregation of Revenue [Line Items]
Net revenue	587.9	562.6	1,128.7	1,048.1
Global [Member] | Software As A Service [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 63.2	$ 38.7	$ 110.7	$ 76.8