Financial Data by Segment - Schedule of Revenues and Assets by Geographic Area (Detail) - USD ($) $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2013 |
Sep. 30, 2013 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2013 |
|
| Schedule Of Geographical Information [Line Items] | |||||||||||
| Revenues | $ 929.6 | $ 634.2 | $ 574.6 | $ 555.8 | $ 885.9 | $ 606.3 | $ 520.6 | $ 545.2 | $ 2,694.2 | $ 2,558.0 | $ 2,430.8 |
| Assets | 2,368.1 | 2,192.1 | 2,368.1 | 2,192.1 | 2,018.2 | ||||||
| United States [Member] | |||||||||||
| Schedule Of Geographical Information [Line Items] | |||||||||||
| Revenues | 2,368.6 | 2,208.9 | 2,097.9 | ||||||||
| Assets | 1,947.1 | 1,830.3 | 1,947.1 | 1,830.3 | 1,739.5 | ||||||
| Canada [Member] | |||||||||||
| Schedule Of Geographical Information [Line Items] | |||||||||||
| Revenues | 224.5 | 244.8 | 243.2 | ||||||||
| Assets | 174.5 | 129.2 | 174.5 | 129.2 | 86.6 | ||||||
| United Kingdom [Member] | |||||||||||
| Schedule Of Geographical Information [Line Items] | |||||||||||
| Revenues | 69.8 | 65.7 | 53.4 | ||||||||
| Assets | 163.2 | 156.5 | 163.2 | 156.5 | 123.5 | ||||||
| Other [Member] | |||||||||||
| Schedule Of Geographical Information [Line Items] | |||||||||||
| Revenues | 31.3 | 38.6 | 36.3 | ||||||||
| Assets | $ 83.3 | $ 76.1 | $ 83.3 | $ 76.1 | $ 68.6 | ||||||