Financial Data by Segment - Schedule of Revenues and Assets by Geographic Area (Details) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2019 |
Mar. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2018 |
Jun. 30, 2018 |
Mar. 31, 2018 |
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2019 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | $ 1,211.2 | $ 1,224.8 | $ 953.4 | $ 972.8 | $ 1,320.4 | $ 1,071.9 | $ 1,012.8 | $ 924.8 | $ 4,362.2 | $ 4,329.9 | $ 4,142.6 |
| Assets | 3,880.7 | 3,304.7 | 3,880.7 | 3,304.7 | 3,149.8 | ||||||
| United States | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | 3,913.8 | 3,907.2 | 3,771.9 | ||||||||
| Assets | 2,870.2 | 2,661.9 | 2,870.2 | 2,661.9 | 2,579.1 | ||||||
| Canada | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | 279.5 | 273.6 | 251.4 | ||||||||
| Assets | 504.8 | 216.7 | 504.8 | 216.7 | 237.9 | ||||||
| United Kingdom | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | 127.5 | 118.7 | 92.1 | ||||||||
| Assets | 277.0 | 257.8 | 277.0 | 257.8 | 238.1 | ||||||
| Other | |||||||||||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||||||||||
| Revenues | 41.4 | 30.4 | 27.3 | ||||||||
| Assets | $ 228.7 | $ 168.3 | $ 228.7 | $ 168.3 | $ 94.7 | ||||||