Shareholders' Deficit - Summary of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2020 |
Jun. 30, 2019 |
Jun. 30, 2020 |
Jun. 30, 2019 |
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| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning balance | $ (388.5) | $ (629.1) | $ (390.0) | $ (723.4) | ||||||||
| Other comprehensive income (loss) before reclassifications, net of tax | 15.9 | (1.8) | (34.8) | 4.3 | ||||||||
| Amounts reclassified from accumulated other comprehensive loss to income, net of tax | 1.0 | [1] | (0.5) | [1] | 1.2 | [2] | (0.9) | [2] | ||||
| Total other comprehensive income (loss) | 16.9 | (2.3) | (33.6) | 3.4 | ||||||||
| Ending balance | (264.8) | (534.2) | (264.8) | (534.2) | ||||||||
| Foreign Currency Translation Adjustments [Member] | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning balance | (268.7) | (204.5) | (211.6) | (211.6) | ||||||||
| Other comprehensive income (loss) before reclassifications, net of tax | 17.2 | (1.8) | (39.9) | 5.3 | ||||||||
| Total other comprehensive income (loss) | 17.2 | (1.8) | (39.9) | 5.3 | ||||||||
| Ending balance | (251.5) | (206.3) | (251.5) | (206.3) | ||||||||
| Unrealized Gain (Loss) on Derivatives [Member] | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning balance | 5.7 | 0.4 | (0.9) | 1.8 | ||||||||
| Other comprehensive income (loss) before reclassifications, net of tax | (1.3) | 5.1 | (1.0) | |||||||||
| Amounts reclassified from accumulated other comprehensive loss to income, net of tax | 1.0 | [1] | (0.5) | [1] | 1.2 | [2] | (0.9) | [2] | ||||
| Total other comprehensive income (loss) | (0.3) | (0.5) | 6.3 | (1.9) | ||||||||
| Ending balance | 5.4 | (0.1) | 5.4 | (0.1) | ||||||||
| Accumulated Other Comprehensive Loss [Member] | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning balance | (263.0) | (204.1) | (212.5) | (209.8) | ||||||||
| Ending balance | $ (246.1) | $ (206.4) | $ (246.1) | $ (206.4) | ||||||||
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