Investments and Related Party Transactions - Schedule of Reconciliation of Minority Partner's Ownership, Reported as Noncontrolling Interest (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Schedule of Equity Method Investments [Line Items] | |||
| Noncontrolling interest - beginning of period | $ 107.9 | ||
| Net income attributable to noncontrolling interest | (20.7) | $ 3.9 | $ 2.7 |
| Other comprehensive income (loss) attributable to noncontrolling interest | (4.0) | (7.7) | |
| Distribution to noncontrolling interest | (8.4) | (7.7) | (13.3) |
| Noncontrolling interest - end of period | 74.8 | 107.9 | |
| TCI [Member] | |||
| Schedule of Equity Method Investments [Line Items] | |||
| Noncontrolling interest - beginning of period | 107.9 | 119.4 | |
| Net income attributable to noncontrolling interest | (20.7) | 3.9 | |
| Other comprehensive income (loss) attributable to noncontrolling interest | (4.0) | (7.7) | |
| Distribution to noncontrolling interest | (8.4) | (7.7) | |
| Noncontrolling interest - end of period | $ 74.8 | $ 107.9 | $ 119.4 |