Revenue Recognition Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 953.4	$ 1,012.8	$ 1,926.2	$ 1,937.6
Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	322.9		664.2
Foreign currency exchange
Disaggregation of Revenue [Line Items]
Revenues	21.4		42.0
Recurring fee revenues
Disaggregation of Revenue [Line Items]
Revenues	603.8		1,179.0
Event-driven fee revenues
Disaggregation of Revenue [Line Items]
Revenues	48.1		125.1
Investor Communication Solutions
Disaggregation of Revenue [Line Items]
Revenues	738.1		1,503.9
Investor Communication Solutions | Total ICS Recurring fee revenues
Disaggregation of Revenue [Line Items]
Revenues	367.2		714.6
Investor Communication Solutions | Equity proxy
Disaggregation of Revenue [Line Items]
Revenues	41.7		72.7
Investor Communication Solutions | Mutual fund and exchange traded funds (“ETF”) interims
Disaggregation of Revenue [Line Items]
Revenues	60.7		118.5
Investor Communication Solutions | Customer communications and fulfillment
Disaggregation of Revenue [Line Items]
Revenues	182.6		357.5
Investor Communication Solutions | Other ICS
Disaggregation of Revenue [Line Items]
Revenues	82.1		165.9
Investor Communication Solutions | Total ICS Event-driven fee revenues
Disaggregation of Revenue [Line Items]
Revenues	48.1		125.1
Investor Communication Solutions | Equity and other
Disaggregation of Revenue [Line Items]
Revenues	19.5		43.6
Investor Communication Solutions | Mutual funds
Disaggregation of Revenue [Line Items]
Revenues	28.6		81.4
Investor Communication Solutions | Distribution revenues
Disaggregation of Revenue [Line Items]
Revenues	322.9		664.2
Global Technology and Operations | Total GTO Recurring fee revenues
Disaggregation of Revenue [Line Items]
Revenues	236.6		464.3
Global Technology and Operations | Equities and other
Disaggregation of Revenue [Line Items]
Revenues	196.5		384.2
Global Technology and Operations | Fixed income
Disaggregation of Revenue [Line Items]
Revenues	$ 40.1		$ 80.1