v3.5.0.2
Investments - Schedule of Reconciliation of Minority Partner's Ownership Interest, Reported as Noncontrolling Interest (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]        
Noncontrolling interest - beginning of period     $ 74.8  
Net income attributable to noncontrolling interest $ 0.5 $ 1.3 0.8 $ 3.1
Other comprehensive income attributable to noncontrolling interest (0.1) (1.7) (2.0) (3.0)
Distribution to noncontrolling interest     (7.1) (8.4)
Noncontrolling interest - end of period 70.5   70.5  
TCI [Member]        
Schedule of Equity Method Investments [Line Items]        
Noncontrolling interest - beginning of period     74.8 107.9
Net income attributable to noncontrolling interest     0.8 3.1
Other comprehensive income attributable to noncontrolling interest     2.0 3.0
Distribution to noncontrolling interest     (7.1) (8.4)
Other       (0.1)
Noncontrolling interest - end of period $ 70.5 $ 105.5 $ 70.5 $ 105.5