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Other Indebtedness - Schedule of Floating Rate Loan Stock, Notes Outstanding (Detail) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Amount $ 56.9 $ 54.8
Other indebtedness, Amount $ 182.5 $ 55.4 [1]
Floating Rate Loan Stock, U.S. Dollar, Start Year 2004 [Member]    
Debt Instrument [Line Items]    
Issue Date Dec. 08, 2004 Dec. 08, 2004
Maturity Nov. 15, 2034 Nov. 15, 2034
Rate Structure First Quarter of 2017 and 2016: 6 month LIBOR + 4.2%  
Interest Rate 5.53% 5.18%
Amount $ 6.5 $ 6.5
Floating Rate Loan Stock, Euro, Start Year 2005 [Member]    
Debt Instrument [Line Items]    
Issue Date Sep. 06, 2005 Sep. 06, 2005
Maturity Aug. 22, 2035 Aug. 22, 2035
Rate Structure First Quarter of 2017 and 2016: 3 month LIBOR + 4.0%  
Interest Rate 3.67% 3.70%
Amount $ 13.5 $ 12.8
Floating Rate Loan Stock, U.S. Dollar, Start Year 2006 [Member]    
Debt Instrument [Line Items]    
Issue Date Oct. 31, 2006 Oct. 31, 2006
Maturity Jan. 15, 2036 Jan. 15, 2036
Rate Structure First Quarter of 2017 and 2016: 6 month LIBOR + 4.0%  
Interest Rate 5.33% 4.98%
Amount $ 10.0 $ 10.0
Floating Rate Loan Stock, Euro, Start Year 2006 [Member]    
Debt Instrument [Line Items]    
Issue Date Oct. 31, 2006 Oct. 31, 2006
Maturity Nov. 22, 2036 Nov. 22, 2036
Rate Structure First Quarter of 2017 and 2016: 3 month LIBOR + 4.0%  
Interest Rate 3.67% 3.70%
Amount $ 11.8 $ 11.2
Floating Rate Loan Stock, Euro, Start Year 2007 [Member]    
Debt Instrument [Line Items]    
Issue Date Jun. 08, 2007 Jun. 08, 2007
Maturity Sep. 15, 2037 Sep. 15, 2037
Rate Structure First Quarter of 2017and 2016: 3 month LIBOR + 3.9%  
Interest Rate 3.57% 3.58%
Amount $ 15.1 $ 14.3
New Credit Agreement [Member]    
Debt Instrument [Line Items]    
Issue Date Mar. 03, 2017  
Maturity Mar. 03, 2019  
Rate Structure 2 month LIBOR + 1.5%  
Interest Rate 2.54%  
Other indebtedness, Amount $ 125.0  
[1] Derived from audited consolidated financial statements.