Reclassifications out of Accumulated Other Comprehensive Income ("AOCI") (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		$ (344.6)	$ (246.4)	$ (379.2)	$ (215.1)
Other comprehensive (loss)/income before reclassification adjustments		(143.2)	(468.3)	(113.6)	(528.9)
Tax effect		53.1	145.4	56.6	171.6
Reclassification adjustments to net earnings		3.3	3.8	5.7	8.8
Tax effect		(1.2)	(1.2)	(2.1)	(3.1)
Accumulated other comprehensive income, ending balance		(432.6)	(566.7)	(432.6)	(566.7)
Currency Translation Adjustment
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		(188.3)	(243.0)	(230.8)	(253.8)
Other comprehensive (loss)/income before reclassification adjustments		4.1	(55.0)	46.6	(44.2)
Tax effect		0.0	0.0	0.0	0.0
Reclassification adjustments to net earnings		0.0	0.0	0.0	0.0
Tax effect		0.0	0.0	0.0	0.0
Accumulated other comprehensive income, ending balance		(184.2)	(298.0)	(184.2)	(298.0)
Net Gains/Losses on Available-for-sale Securities
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		59.0	288.5	68.3	333.8
Other comprehensive (loss)/income before reclassification adjustments		(147.3)	(413.3)	(160.2)	(484.7)
Tax effect		53.1	145.4	56.6	171.6
Reclassification adjustments to net earnings	[1]	1.0	(1.3)	1.1	(1.4)
Tax effect		(0.4)	0.6	(0.4)	0.6
Accumulated other comprehensive income, ending balance		(34.6)	19.9	(34.6)	19.9
Pension Liability
AOCI Net of Tax [Roll Forward]
Accumulated other comprehensive income, beginning balance		(215.3)	(291.9)	(216.7)	(295.1)
Other comprehensive (loss)/income before reclassification adjustments		0.0	0.0	0.0	0.0
Tax effect		0.0	0.0	0.0	0.0
Reclassification adjustments to net earnings	[2]	2.3	5.1	4.6	10.2
Tax effect		(0.8)	(1.8)	(1.7)	(3.7)
Accumulated other comprehensive income, ending balance		$ (213.8)	$ (288.6)	$ (213.8)	$ (288.6)

[1] (A) Reclassification adjustments out of AOCI are included within Other income, net, on the Statements of Consolidated Earnings.

[2] (B) Reclassification adjustments out of AOCI are included in net pension expense (see Note 12).