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Long-Term Debt - Senior Notes Offering (Details)
$ in Millions
3 Months Ended 12 Months Ended
Apr. 16, 2018
USD ($)
Apr. 03, 2017
USD ($)
Feb. 13, 2017
EUR (€)
Feb. 13, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
CAD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 13, 2017
USD ($)
Sep. 09, 2013
USD ($)
Proceeds from Issuance of Long-term Debt                   $ 0 $ 1,789,200,000 $ 0    
Gain (Loss) on Extinguishment of Debt         $ (2,500,000) $ (4,400,000)     $ (2,700,000) $ (2,493,000) (7,052,000) $ 0    
Four and Three Quarters Percent Senior Notes due 2025 [Member]                            
Debt Instrument, Face Amount                         $ 300,000,000  
Redemption Price Percent If Change in Control Occurs     101.00%                   101.00%  
Proceeds from Issuance of Long-term Debt       $ 296,500,000                    
Three and One Quarter Percent Senior Notes due 2025 [Member]                            
Debt Instrument, Face Amount | €     € 650,000,000                      
Redemption Price Percent If Change in Control Occurs     101.00%                   101.00%  
Proceeds from Issuance of Long-term Debt | €     € 643,400,000                      
Debt Instrument Redemption Period - Post March 15 2020 [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member]                            
Debt Instrument, Redemption Price, Percentage, Initial, Plus Accrued and Unpaid Interest     102.375% 102.375%                    
Debt Instrument Redemption Period - Post March 15 2020 [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member]                            
Debt Instrument, Redemption Price, Percentage, Initial, Plus Accrued and Unpaid Interest     101.625% 101.625%                    
Debt Instrument Redemption Period - Post March 15 2022 [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member]                            
Debt Instrument, Redemption Price, Percentage, Ending, PLus Accrued and Unpaid Interest     100.00% 100.00%                    
Debt Instrument Redemption Period - Post March 15 2022 [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member]                            
Debt Instrument, Redemption Price, Percentage, Ending, PLus Accrued and Unpaid Interest     100.00% 100.00%                    
Debt Instrument, Redemption - Pre March 15 2020 [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member]                            
Maximum Redemption Percent Allowed And Limited To Proceeds From Equity Offering     35.00%                   35.00%  
Debt Redemption, Price Percent Of Principal Amount, From the Proceeds of Certain Equity Offerings     104.75%                   104.75%  
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium     100.00% 100.00%                    
Debt Instrument, Redemption - Pre March 15 2020 [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member]                            
Debt Redemption, Price Percent Of Principal Amount, From the Proceeds of Certain Equity Offerings     103.25%                   103.25%  
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium     100.00% 100.00%                    
Debt Instrument, Redemption, Period One [Member] | Five and One Half Percent Senior Notes due 2022 [Member]                            
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium                   101.375%        
US Term Loan - 1 [Member]                            
Repayments of Debt                 212,300,000          
Euro Term Loans [Member]                            
Repayments of Debt | €             € 187,000,000              
Other Foreign Bank Revolving And Term Loans [Member]                            
Repayments of Debt | €             € 34,000,000              
Senior Notes [Member] | Four and Three Quarters Percent Senior Notes due 2025 [Member]                            
Debt Instrument Offering Price Percentage     100.00%                   100.00%  
Senior Notes [Member] | Three and One Quarter Percent Senior Notes due 2025 [Member]                            
Debt Instrument Offering Price Percentage     100.00%                   100.00%  
Senior Notes [Member] | Five and One Half Percent Senior Notes due 2022 [Member]                            
Debt Instrument, Face Amount                           $ 300,000,000
Debt Instrument Offering Price Percentage                           100.00%
Redemption Price Percent If Change in Control Occurs                           101.00%
Senior Notes [Member] | Five Percent Senior Notes due 2020 [Member]                            
Debt Instrument, Redemption Price, Percentage Plus a Make-Whole Premium 100.00% 101.25%                        
Gain (Loss) on Extinguishment of Debt         $ (1,400,000) $ (4,400,000)                
Early Repayment of Senior Debt $ 280,000,000 $ 220,000,000.0                        
US Term Loan [Member]                            
Repayments of Debt                 $ 98,000,000          
Canadian Term Loans [Member]                            
Repayments of Debt               $ 14.0            
Term Loan [Member]                            
Gain (Loss) on Extinguishment of Debt                     $ (6,500,000)