Financial Data by Segment - Schedule of Financial Data Segment Reporting Information (Details) $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2017 USD ($) segment	Jun. 30, 2017 USD ($) Segment	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of segments									2	2
Revenues	$ 1,345.7	$ 1,008.9	$ 892.6	$ 895.3	$ 974.5	$ 688.8	$ 638.9	$ 594.7			$ 4,142.6	$ 2,897.0	$ 2,694.2
Earnings (loss) before income taxes	284.7	$ 106.3	$ 45.7	$ 51.5	262.5	$ 93.4	$ 61.3	$ 51.7			488.1	468.9	438.9
Assets	3,149.8				2,872.7				$ 3,149.8	$ 3,149.8	3,149.8	2,872.7	2,364.8
Capital expenditures											85.4	57.7	48.4
Depreciation and amortization											68.6	52.6	49.3
Amortization of acquired intangibles and purchased intellectual property											72.6	31.8	25.3
Amortization of other assets											31.9	26.6	29.7
Operating Segments | Investor Communication Solutions
Segment Reporting Information [Line Items]
Revenues											3,421.4	2,220.4	2,030.2
Earnings (loss) before income taxes											421.0	409.1	381.4
Assets	1,989.0				1,475.2				1,989.0	1,989.0	1,989.0	1,475.2	1,346.9
Capital expenditures											34.1	40.7	34.9
Depreciation and amortization											48.7	30.7	27.8
Amortization of acquired intangibles and purchased intellectual property											62.7	26.7	20.2
Amortization of other assets											12.4	6.6	6.9
Operating Segments | Global Technology and Operations
Segment Reporting Information [Line Items]
Revenues											802.7	738.0	692.5
Earnings (loss) before income taxes											169.6	135.4	120.3
Assets	828.3				712.0				828.3	828.3	828.3	712.0	786.1
Capital expenditures											10.7	5.8	6.6
Depreciation and amortization											8.7	11.1	12.7
Amortization of acquired intangibles and purchased intellectual property											9.9	5.1	5.1
Amortization of other assets											14.9	15.7	17.7
Other
Segment Reporting Information [Line Items]
Revenues											0.0	0.0	0.0
Earnings (loss) before income taxes											(110.5)	(79.0)	(73.5)
Assets	332.4				685.5				332.4	332.4	332.4	685.5	231.8
Capital expenditures											40.5	11.2	6.9
Depreciation and amortization											11.1	10.9	8.8
Amortization of acquired intangibles and purchased intellectual property											0.0	0.0	0.0
Amortization of other assets											4.6	4.3	5.1
Foreign Currency Exchange
Segment Reporting Information [Line Items]
Revenues											(81.5)	(61.4)	(28.5)
Earnings (loss) before income taxes											8.1	3.4	10.7
Assets	$ 0.0				$ 0.0				$ 0.0	$ 0.0	0.0	0.0	0.0
Capital expenditures											0.0	0.0	0.0
Depreciation and amortization											0.0	0.0	0.0
Amortization of acquired intangibles and purchased intellectual property											0.0	0.0	0.0
Amortization of other assets											$ 0.0	$ 0.0	$ 0.0