Summary Of Significant Accounting Policies (Summary Of Net Revenue Disaggregated By Product And Region) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
U.S., Canada And Latin America [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 429.9	$ 357.4	$ 1,225.6	$ 1,060.0
U.S., Canada And Latin America [Member] | Devices [Member]
Disaggregation of Revenue [Line Items]
Net revenue	181.3	168.1	540.2	499.7
U.S., Canada And Latin America [Member] | Masks And Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	168.7	149.4	494.8	443.7
U.S., Canada And Latin America [Member] | Total Sleep And Respiratory Care [Member]
Disaggregation of Revenue [Line Items]
Net revenue	350.0	317.5	1,035.0	943.4
U.S., Canada And Latin America [Member] | Software As A Service [Member]
Disaggregation of Revenue [Line Items]
Net revenue	79.9	39.9	190.6	116.6
Combined Europe, Asia And Other Markets [Member] | Devices [Member]
Disaggregation of Revenue [Line Items]
Net revenue	155.2	160.1	463.0	451.8
Combined Europe, Asia And Other Markets [Member] | Masks And Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	77.1	74.1	213.0	204.8
Combined Europe, Asia And Other Markets [Member] | Total Sleep And Respiratory Care [Member]
Disaggregation of Revenue [Line Items]
Net revenue	232.3	234.2	676.0	656.6
Global [Member]
Disaggregation of Revenue [Line Items]
Net revenue	662.2	591.6	1,901.6	1,716.6
Global [Member] | Devices [Member]
Disaggregation of Revenue [Line Items]
Net revenue	336.5	328.2	1,003.2	951.5
Global [Member] | Masks And Other [Member]
Disaggregation of Revenue [Line Items]
Net revenue	245.8	223.5	707.8	648.5
Global [Member] | Total Sleep And Respiratory Care [Member]
Disaggregation of Revenue [Line Items]
Net revenue	582.3	551.7	1,711.0	1,600.0
Global [Member] | Software As A Service [Member]
Disaggregation of Revenue [Line Items]
Net revenue	$ 79.9	$ 39.9	$ 190.6	$ 116.6