Shareholders' Equity - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2017 |
Sep. 30, 2016 |
Sep. 30, 2017 |
Sep. 30, 2016 |
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| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning Balance | $ 196.3 | |||||||||||
| Other comprehensive income (loss) before reclassifications, net of tax | $ 11.1 | $ (1.8) | 30.2 | $ 5.0 | ||||||||
| Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax | 2.7 | [1] | (3.0) | [1] | 0.3 | [2] | (12.8) | [2] | ||||
| Total other comprehensive income (loss) | 13.8 | (4.8) | 30.5 | (7.8) | ||||||||
| Ending balance | 219.0 | 219.0 | ||||||||||
| Foreign Currency Translation Adjustments [Member] | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning Balance | (185.8) | (178.8) | (215.5) | (183.0) | ||||||||
| Other comprehensive income (loss) before reclassifications, net of tax | 11.3 | (2.6) | 41.0 | 1.6 | ||||||||
| Total other comprehensive income (loss) | 11.3 | (2.6) | 41.0 | 1.6 | ||||||||
| Ending balance | (174.5) | (181.4) | (174.5) | (181.4) | ||||||||
| Unrealized Gain (Loss) on Derivatives [Member] | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning Balance | (2.6) | 10.3 | 10.4 | 17.4 | ||||||||
| Other comprehensive income (loss) before reclassifications, net of tax | (0.2) | 0.8 | (10.8) | 3.4 | ||||||||
| Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax | 2.7 | [1] | (3.0) | [1] | 0.3 | [2] | (12.7) | [2] | ||||
| Total other comprehensive income (loss) | 2.5 | (2.2) | (10.5) | (9.3) | ||||||||
| Ending balance | (0.1) | 8.1 | (0.1) | 8.1 | ||||||||
| Other [Member] | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning Balance | 0.1 | |||||||||||
| Amounts reclassified from accumulated other comprehensive income (loss) to income, net of tax | [2] | (0.1) | ||||||||||
| Total other comprehensive income (loss) | (0.1) | |||||||||||
| Accumulated Other Comprehensive Income (Loss) [Member] | ||||||||||||
| Accumulated Other Comprehensive Income (Loss) [Line Items] | ||||||||||||
| Beginning Balance | (188.4) | (168.5) | (205.1) | (165.5) | ||||||||
| Ending balance | $ (174.6) | $ (173.3) | $ (174.6) | $ (173.3) | ||||||||
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