Borrowing Arrangements Fair Value Notes (Details) - Senior Notes - USD ($)	Jan. 31, 2020	Jun. 30, 2017	Jun. 30, 2015	Dec. 31, 2012
2012 Senior Notes
Debt Instrument [Line Items]
Face amount	$ 350,000,000.0			$ 350,000,000.0
Fair value disclosure	364,000,000.0
Senior Notes due 2017
Debt Instrument [Line Items]
Face amount	500,000,000.0	$ 500,000,000.0
Fair value disclosure	535,000,000.0
Senior Notes due 2020
Debt Instrument [Line Items]
Face amount	450,000,000.0		$ 450,000,000.0
Fair value disclosure	451,500,000
Senior Notes due 2025
Debt Instrument [Line Items]
Face amount	300,000,000.0		$ 300,000,000.0
Fair value disclosure	331,900,000
2.85 Notes due January 15 2030
Debt Instrument [Line Items]
Face amount	500,000,000.0
Fair value disclosure	$ 513,300,000