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Long-term Debt and Short-term Borrowings (Narrative) (Details)
€ in Millions, AUD in Millions
8 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2017
USD ($)
Jun. 30, 2017
Dec. 22, 2016
USD ($)
May 02, 2016
USD ($)
May 02, 2016
AUD
Dec. 31, 2015
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jan. 27, 2017
USD ($)
Jan. 27, 2017
EUR (€)
Jan. 27, 2017
AUD
May 02, 2016
AUD
Apr. 28, 2015
USD ($)
Debt Instrument [Line Items]                              
Total debt   $ 939,500,000           $ 939,500,000 $ 703,500,000            
Call premium               0 (29,900,000) $ (1,900,000)          
Debt issuance costs incurred               3,600,000 6,900,000 $ 1,700,000          
Five Year Senior Secured Credit Facility Maturing April 2020 [Member]                              
Debt Instrument [Line Items]                              
Credit agreement, term             5 years                
Australian Dollar Short Term Bank Debt and Notes Payable [Member]                              
Debt Instrument [Line Items]                              
Debt assumed at acquisition         $ 24,500,000 AUD 32.1                  
Senior Secured Notes | Euro Term Loan A                              
Debt Instrument [Line Items]                              
Credit agreement, face amount                     $ 320,800,000 € 300.0      
Senior Secured Notes | AUD Term Loan A                              
Debt Instrument [Line Items]                              
Max borrowing capacity                     60,400,000   AUD 80.0    
Senior Secured Notes | U.S. Dollar Senior Secured Term Loan A, due April 2020 (floating interest rate of 2.27% at December 31, 2016)                              
Debt Instrument [Line Items]                              
Total debt   0           0 81,000,000            
Credit agreement, face amount                             $ 300,000,000
Debt payment amount         78,000,000                    
Senior Secured Notes | Five Year Senior Secured Credit Facility Maturing April 2020 [Member]                              
Debt Instrument [Line Items]                              
Max borrowing capacity                             600,000,000
Senior Secured Notes | Australian Dollar Senior Secured Term Loan A, due April 2020 (floating interest rate of 3.25% at December 31, 2016)                              
Debt Instrument [Line Items]                              
Total debt   0     76,600,000     0 70,300,000         AUD 100.0  
Senior Secured Notes | Australian Dollar Senior Secured Revolving Credit Facility, due April 2020 (floating interest rate of 3.27% at December 31, 2016)                              
Debt Instrument [Line Items]                              
Total debt   0     $ 116,400,000     0 87,900,000         AUD 152.0  
Senior Notes | Senior Unsecured Notes, due December 2024 (fixed interest rate of 5.25%)                              
Debt Instrument [Line Items]                              
Total debt   $ 400,000,000   $ 400,000,000.0       $ 400,000,000 $ 400,000,000            
Stated percentage   5.25%           5.25% 5.25%            
Debt issuance costs incurred       $ 6,100,000                      
Senior Notes | Senior Unsecured Notes, due April 2020 (fixed interest rate of 6.75%)                              
Debt Instrument [Line Items]                              
Stated percentage       6.75%                      
Redemption price       $ 531,500,000                      
Senior Notes | Senior Unsecured Notes, due April 2020 (fixed interest rate of 6.75%) | Other expense, net                              
Debt Instrument [Line Items]                              
Call premium       25,000,000                      
Write off amount       4,900,000                      
Senior Notes | Senior Unsecured Notes, due April 2020 (fixed interest rate of 6.75%) | Interest Expense                              
Debt Instrument [Line Items]                              
Accrued and unpaid interest       6,500,000                      
Senior Secured Credit Facility Due January 2022                              
Debt Instrument [Line Items]                              
Credit agreement, term               5 years              
Senior Secured Credit Facility Due January 2022 | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Proceeds from sales or dispositions of property or assets               $ 12,000,000              
Proceeds from sales or dispositions of property or assets, percentage               100.00%              
Dividends and/or purchase shares, threshold               $ 30,000,000              
Dividends and/or purchase shares, threshold, percent of total assets               1.00%              
Minimum leverage ratio for payment of dividends or repurchase of shares   2.50           2.50              
Maximum leverage ratio for payment of dividends or repurchase of shares   3.75           3.75              
Leverage ratio   2.6           2.6              
Leverage ratio, potential increase   0.50           0.50              
Fixed charge coverage ratio               5.3              
Maximum borrowing capacity, potential increase   $ 500,000,000           $ 500,000,000              
Senior Secured Credit Facility Due January 2022 | Senior Secured Notes | AUD Term Loan A                              
Debt Instrument [Line Items]                              
Proceeds from sales or dispositions of property or assets, percentage               100.00%              
2017 Revolving Facility | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Max borrowing capacity                     $ 400,000,000        
Commitment fee percent               0.30%              
Total debt   133,900,000           $ 133,900,000              
Amount available for borrowings under the Restated Revolver Facility   255,000,000           255,000,000              
Letters of credit outstanding, amount   $ 11,100,000           $ 11,100,000              
2017 Revolving Facility | Senior Secured Notes | 2015 Revolving Facility                              
Debt Instrument [Line Items]                              
Max borrowing capacity                             $ 300,000,000
Proceeds from lines of credit       $ 73,900,000                      
Minimum | Senior Secured Notes | Senior Secured Term Loan As, due January 2022                              
Debt Instrument [Line Items]                              
Quarterly principal payment, based on annual percentage     5.00%                        
Minimum | Senior Secured Credit Facility Due January 2022 | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Fixed charge coverage ratio               1.25              
Minimum | 2017 Revolving Facility | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Commitment fee percent               0.25%              
Maximum | Senior Secured Credit Facility Due January 2022 | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Dividends and/or purchase shares, threshold               $ 75,000,000              
Leverage ratio   3.75           3.75              
Maximum | 2017 Revolving Facility | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Commitment fee percent               0.40%              
Euro/AUD/CDN | Senior Secured Credit Facility Due January 2022 | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   1.50%                          
Euro/AUD/CDN | Minimum | Senior Secured Credit Facility Due January 2022 | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Base rate percent               0.00%              
Applicable Rate on Base Rate Loans | Senior Secured Credit Facility Due January 2022 | Senior Secured Notes                              
Debt Instrument [Line Items]                              
Debt Instrument, Basis Spread on Variable Rate   0.50%                          
Forecast | Maximum | Senior Secured Notes | Senior Secured Term Loan As, due January 2022                              
Debt Instrument [Line Items]                              
Quarterly principal payment, based on annual percentage 12.50%