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Indebtedness - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 12, 2017
Sep. 26, 2016
USD ($)
Mar. 15, 2016
USD ($)
Mar. 07, 2016
USD ($)
Mar. 30, 2015
EUR (€)
Mar. 30, 2015
USD ($)
Dec. 02, 2014
USD ($)
Mar. 31, 2018
USD ($)
Jul. 01, 2017
USD ($)
Jul. 01, 2017
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Mar. 08, 2018
EUR (€)
Mar. 08, 2018
USD ($)
Mar. 30, 2015
USD ($)
Nov. 08, 2013
USD ($)
Debt Instrument [Line Items]                                  
Debt instrument, issuance date       Mar. 07, 2016                          
Extinguishment of debt   $ 500,000,000.0                   $ 2,600,000,000          
Loans payable                     $ 351,300,000 420,000,000.0          
Loss on extinguishment of debt               $ 500,000 $ 135,200,000   500,000 135,200,000 $ 1,100,000        
Senior notes                     2,892,500,000 2,906,000,000.0         $ 2,300,000,000
Line of credit facility, fair value of amount outstanding                     0 6,900,000          
2015 Revolver                                  
Debt Instrument [Line Items]                                  
Repayments of debt     $ 750,000,000.0                            
2018 Revolver                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                             $ 1,000,000,000.0    
2014 Euro-Denominated Term Loan due December 5, 2019                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount | €                           € 350,000,000.0      
Loans payable [1]                     $ 0 420,000,000.0          
Debt instrument, description                     2014 Term loan due December 5, 2019            
2018 Euro-Denominated Term Loan due March 8, 2020                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                           € 350,000,000.0 $ 431,000,000.0    
Repayments of debt                     $ 51,500,000            
Debt instrument, description                     2018 Term loan due March 8, 2020            
5.125% Senior note due 2017                                  
Debt Instrument [Line Items]                                  
Debt instrument, description 2014 term loan due December 5, 2019                                
3.500% Unsecured Senior notes due March 15, 2021                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount       $ 500,000,000.0                          
Interest rate, stated percentage       3.50%             3.50%            
Senior notes [2]                     $ 280,400,000 280,400,000          
Debt instrument, description                     March 15, 2021            
4.375% senior note due March 15, 2026                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount       $ 700,000,000.0                          
Interest rate, stated percentage       4.375%             4.375%            
Senior notes [2]                     $ 700,000,000.0 700,000,000.0          
Debt instrument, description                     March 15, 2026            
Debt securities                                  
Debt Instrument [Line Items]                                  
Senior notes       $ 1,200,000,000                          
3.5% Senior note due 2021                                  
Debt Instrument [Line Items]                                  
Debt instrument, issuance date             Dec. 02, 2014                    
Debt instrument, face amount             $ 500,000,000.0                    
Interest rate, stated percentage             3.50%       3.50%            
Senior notes [3]                     $ 309,600,000 309,600,000          
Maturity date             Jan. 01, 2021                    
Debt instrument, description                   $500.0 3.500% senior notes due 2021 December 15, 2021            
3.9% senior note due 2024                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount             $ 700,000,000.0                    
Interest rate, stated percentage             3.90%       3.90%            
Senior notes [3]                     $ 700,000,000.0 700,000,000.0          
Maturity date             Jan. 01, 2024                    
Debt instrument, description                     December 15, 2024            
4.9% Senior Loan due 2044                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount             $ 400,000,000.0                    
Interest rate, stated percentage             4.90%       4.90%            
Senior notes [3]                     $ 303,900,000 303,900,000          
Maturity date             Jan. 01, 2044                    
Debt instrument, description                   $400.0 4.900% senior notes due 2044 December 15, 2044            
2014 bonds                                  
Debt Instrument [Line Items]                                  
Senior notes             $ 1,600,000,000                    
1.30% Unsecured Senior Notes due November 8, 2016                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 $ 500,000,000.0
Interest rate, stated percentage   1.30%                             1.30%
2.30% Unsecured Senior notes November 8, 2018                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 $ 600,000,000.0
Interest rate, stated percentage                                 2.30%
4.00% Unsecured Senior Notes due November 15, 2023                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 $ 800,000,000.0
Interest rate, stated percentage                     4.00%           4.00%
Senior notes [4]                     $ 215,600,000 215,600,000          
Debt instrument, description                     November 15, 2023            
5.30% Unsecured Senior Notes due November 15, 2043                                  
Debt Instrument [Line Items]                                  
Debt instrument, face amount                                 $ 400,000,000.0
Interest rate, stated percentage                     5.30%           5.30%
Senior notes [4]                     $ 90,500,000 $ 90,500,000          
Debt instrument, description                   $400.0 5.300% senior notes due 2043 November 15, 2043            
Omega | 6.19% Senior Note                                  
Debt Instrument [Line Items]                                  
Business combination, current liabilities, long-term debt                               $ 20,000,000.0  
Interest rate, stated percentage         6.19%                     6.19%  
Maturity date         Jan. 01, 2016 Jan. 01, 2016                      
Omega | 5.1045% Senior Note                                  
Debt Instrument [Line Items]                                  
Interest rate, stated percentage         5.105%                     5.105%  
Maturity date         Jan. 01, 2023 Jan. 01, 2023                      
Long-term debt         € 135,000,000.0                     $ 147,000,000.0  
Omega | 5.125% Retail Bond                                  
Debt Instrument [Line Items]                                  
Business combination, current liabilities, long-term debt         € 300,000,000.0                     $ 326,700,000  
Interest rate, stated percentage         5.125%                     5.125%  
Maturity date         Jan. 01, 2017 Jan. 01, 2017                      
Omega | 4.5% Retail Bond                                  
Debt Instrument [Line Items]                                  
Business combination, current liabilities, long-term debt         € 180,000,000.0                     $ 196,000,000.0  
Interest rate, stated percentage         4.50%                     4.50%  
Maturity date         Jan. 01, 2017 Jan. 01, 2017                      
Omega | 5.0% Retail Bond [Member]                                  
Debt Instrument [Line Items]                                  
Business combination, current liabilities, long-term debt         € 120,000,000.0                     $ 130,700,000  
Interest rate, stated percentage         5.00%                     5.00%  
Maturity date         Jan. 01, 2019 Jan. 01, 2019                      
Omega                                  
Debt Instrument [Line Items]                                  
Amount debt exceeded par value         € 93,600,000 $ 101,900,000                      
[1] *Debt denominated in euros subject to fluctuations in the euro-to-U.S. dollar exchange rate.
[2] Discussed below collectively as the "2016 Notes"
[3] Discussed below collectively as the "2014 Notes"
[4] Discussed below collectively as the "2013 Notes"