Fair Value Measurements - Schedule of carrying amounts and estimated fair values of financial instruments not recorded at fair value in the financial statements (Details) - Level 2 - USD ($) $ in Millions |
Mar. 31, 2019 |
Jun. 30, 2018 |
---|---|---|
Carrying Value | ||
Carrying amounts and estimated fair values of financial instruments not recorded at fair value | ||
Long-term debt | $ 549.0 | $ 545.7 |
Company-owned life insurance | 16.8 | 16.4 |
Fair Value | ||
Carrying amounts and estimated fair values of financial instruments not recorded at fair value | ||
Long-term debt | 562.0 | 558.3 |
Company-owned life insurance | $ 16.8 | $ 16.4 |