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Indebtedness - Additional Information (Detail)
€ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Debt, aggregate principal amount     $ 5,580.4 $ 3,377.4
Commercial paper     129.9  
Commercial Paper [Member]        
Debt Instrument [Line Items]        
Maximum Borrowing Capacity     1,000.0  
Issuance date of debt   Aug. 03, 2016    
Debt, aggregate principal amount     $ 130.0  
Debt Weighted Average Interest Rate 1.76%   1.76%  
Line Of Credit Facility Expiration Period   15 days    
Commercial Paper [Member] | Date of issuance [Member]        
Debt Instrument [Line Items]        
Line Of Credit Facility Expiration Period   30 days    
Commercial Paper [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Term of notes   397 days    
2015 Facility [Member]        
Debt Instrument [Line Items]        
Maximum Borrowing Capacity     $ 1,000.0  
Issuance date of debt May 11, 2015      
2017 Term Loan Facility [Member]        
Debt Instrument [Line Items]        
Maximum Borrowing Capacity     500.0  
Maturity date of Senior Unsecured Notes/Loan   Jun. 06, 2017    
Issuance date of debt   Jun. 06, 2020    
Debt, aggregate principal amount     $ 500.0  
2017 Term Loan Facility [Member] | Borrowing Date [Member]        
Debt Instrument [Line Items]        
Issuance date of debt   Aug. 08, 2017    
2017 Term Loan Facility [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt Instrument Premium Rate in Addition to Adjusted LIBO Rate 0.875%   0.875%  
Debt Instrument Premium Rate in Addition to Alternate Base Rate 0.00%   0.00%  
2017 Term Loan Facility [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt Instrument Premium Rate in Addition to Adjusted LIBO Rate 1.50%   1.50%  
Debt Instrument Premium Rate in Addition to Alternate Base Rate 0.50%   0.50%  
2017 Term Loan Facility [Member] | Maximum [Member] | Fiscal quarter ending on September 30, 2017 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4.5    
2017 Term Loan Facility [Member] | Maximum [Member] | Fiscal quarter ending on December 31, 2017 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4.5    
2017 Term Loan Facility [Member] | Maximum [Member] | Fiscal quarter ending on March 31, 2018 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4.5    
2017 Term Loan Facility [Member] | Maximum [Member] | Fiscal quarter ending on June 30, 2018 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4    
Series 2007-1 Notes [Member]        
Debt Instrument [Line Items]        
Issuance date of debt   Sep. 07, 2007    
Debt, aggregate principal amount     $ 300.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Senior unsecured notes, interest 6.06%   6.06%  
Prepayment penalities of Notes   $ 7.0    
Series 2007-1 Notes [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4    
2010 Senior Notes [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Sep. 01, 2020    
Issuance date of debt   Aug. 19, 2010    
Debt, aggregate principal amount     $ 500.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Senior unsecured notes, interest 5.50%   5.50%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of principal amount, plus accrued and unpaid interest to the date of purchase   101.00%    
2012 Senior Notes [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Sep. 01, 2022    
Issuance date of debt   Aug. 20, 2012    
Debt, aggregate principal amount     $ 500.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Senior unsecured notes, interest 4.50%   4.50%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of principal amount, plus accrued and unpaid interest to the date of purchase   101.00%    
2013 Senior Notes [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Feb. 15, 2024    
Issuance date of debt   Aug. 12, 2013    
Debt, aggregate principal amount     $ 500.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Senior unsecured notes, interest 4.875%   4.875%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of principal amount, plus accrued and unpaid interest to the date of purchase   101.00%    
2014 Senior Notes (5-Year) [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Jul. 15, 2019    
Issuance date of debt   Jul. 16, 2014    
Debt, aggregate principal amount     $ 450.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Senior unsecured notes, interest 2.75%   2.75%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of principal amount, plus accrued and unpaid interest to the date of purchase   101.00%    
2014 Senior Notes (30-Year) [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Jul. 15, 2044    
Issuance date of debt   Jul. 16, 2014    
Debt, aggregate principal amount     $ 300.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Senior unsecured notes, interest 5.25%   5.25%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of principal amount, plus accrued and unpaid interest to the date of purchase   101.00%    
2014 Senior Notes (30-Year) [Member] | November 13, 2015 [Member]        
Debt Instrument [Line Items]        
Issuance date of debt   Nov. 13, 2015    
Debt, aggregate principal amount     $ 300.0  
2015 Senior Notes [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Mar. 27, 2027    
Issuance date of debt   Mar. 09, 2015    
Debt, aggregate principal amount | € € 500.0      
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Senior unsecured notes, interest 1.75%   1.75%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of principal amount, plus accrued and unpaid interest to the date of purchase   101.00%    
2015 (A) Credit Facility [Member]        
Debt Instrument [Line Items]        
Issuance date of debt   Jun. 06, 2017    
2015 (A) Credit Facility [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Debt Instrument Facility Fee Basis Points 0.08%   0.08%  
Debt Instrument Rate for Eurocurrency Loans 0.795%   0.795%  
Debt Instrument Rate for Alternate Base Rate Loans 0.00%   0.00%  
2015 (A) Credit Facility [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt Instrument Facility Fee Basis Points 0.175%   0.175%  
Debt Instrument Rate for Eurocurrency Loans 1.325%   1.325%  
Debt Instrument Rate for Alternate Base Rate Loans 0.325%   0.325%  
2015 (A) Credit Facility [Member] | Maximum [Member] | Fiscal quarter ending on September 30, 2017 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4.5    
2015 (A) Credit Facility [Member] | Maximum [Member] | Fiscal quarter ending on December 31, 2017 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4.5    
2015 (A) Credit Facility [Member] | Maximum [Member] | Fiscal quarter ending on March 31, 2018 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4.5    
2015 (A) Credit Facility [Member] | Maximum [Member] | Fiscal quarter ending on June 30, 2018 [Member]        
Debt Instrument [Line Items]        
Debt/EBITDA ratio   4    
2017 Senior Notes [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Dec. 15, 2021    
Issuance date of debt   Mar. 02, 2017    
Debt, aggregate principal amount     $ 500.0  
Senior unsecured notes, interest 2.75%   2.75%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of Principal Amount Being Paid After Redemption of Notes 100.00%   100.00%  
2017 Floating Rate Senior Notes [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Sep. 04, 2018    
Issuance date of debt   Mar. 02, 2017    
Debt, aggregate principal amount     $ 300.0  
Percentage included in Calculation of Senior Notes Floating Rate Plus LIBOR 0.35%   0.35%  
Percentage of Principal Amount Being paid after Incompletion of Acquisition or Termination of Share Purchase Agreement   101.00%    
2.625% 2017 Private Placement Notes, due 2023 [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Jan. 15, 2023    
Issuance date of debt   Jun. 12, 2017    
Debt, aggregate principal amount     $ 500.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Percentage of Principal Amount Being paid after Incompletion of Acquisition or Termination of Share Purchase Agreement   101.00%    
Senior unsecured notes, interest 2.625%   2.625%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of Principal Amount Being Paid after Occurence of Triggering Event   101.00%    
3.25% 2017 Private Placement Notes, due 2028 [Member]        
Debt Instrument [Line Items]        
Maturity date of Senior Unsecured Notes/Loan   Jan. 15, 2028    
Issuance date of debt   Jun. 12, 2017    
Debt, aggregate principal amount     $ 500.0  
Percentage of principal amount being prepaid, plus accrued and unpaid interest   100.00%    
Percentage of Principal Amount Being paid after Incompletion of Acquisition or Termination of Share Purchase Agreement   101.00%    
Senior unsecured notes, interest 3.25%   3.25%  
Minimum percentage of aggregate principal amount   25.00%    
Minimum Aggregate Amount to be Paid on Maturity that Trips the Cross Default     $ 50.0  
Percentage of Principal Amount Being Paid after Occurence of Triggering Event   101.00%    
2017 Bridge Credit Facility [Member]        
Debt Instrument [Line Items]        
Maximum Borrowing Capacity     1,500.0  
Issuance date of debt   May 15, 2017    
Copal [Member]        
Debt Instrument [Line Items]        
Issuance date of debt   Nov. 04, 2011    
Debt, aggregate principal amount     $ 14.2