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Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Sep. 27, 2019
Sep. 06, 2019
Jul. 25, 2019
Jun. 13, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Nov. 21, 2017
Class of Stock [Line Items]                          
Common Stock, Shares Authorized         450,000,000   450,000,000     450,000,000      
Common stock, par value per share         $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01  
Common Stock, Shares Issued         143,340,846   143,340,846     140,239,977      
Common Stock, Shares Outstanding         143,340,846   143,340,846     140,239,977      
Preferred Stock, Shares Authorized         50,000,000   50,000,000            
Preferred stock, par value per share         $ 0.01   $ 0.01            
Preferred Stock, Shares Issued         0   0            
Preferred Stock, Shares Outstanding         0   0            
Restriction for disposition of assets acquired       5 years                  
Distributions to holders of Class A equity interests of a subsidiary             $ 103.9 $ 102.0          
Stock Issued During Period, Shares, Issued for Services             7,043            
Stock Issued During Period, Value, Issued for Services             $ 0.1            
Dividends declared per common share (in dollars per share)         $ 0.36 $ 0.36 $ 0.72 $ 0.72          
Subsequent Event                          
Class of Stock [Line Items]                          
Dividends Payable, Date Declared     Jul. 25, 2019                    
Dividends declared per common share (in dollars per share)     $ 0.36                    
Ordinary dividend | Subsequent Event                          
Class of Stock [Line Items]                          
Dividends Payable, Date to be Paid Sep. 27, 2019                        
Dividends Payable, Date of Record   Sep. 06, 2019                      
At-The-Market Equity Offering Program                          
Class of Stock [Line Items]                          
At-The-Market Equity Offering Program, Authorized Amount Outstanding         $ 232.5   $ 232.5           $ 300.0
Shares issued under the ATM Program         1,400,000   2,150,000            
Shares issued under the ATM Program (value)         $ 35.0   $ 52.0            
Payments of Stock Issuance Costs         0.5   0.8            
Sale of Stock, Consideration Received on Transaction         34.5   $ 51.2            
Noncontrolling Interest                          
Class of Stock [Line Items]                          
Equity interest issued for an acquisition (in shares)             1,953,407            
Distributions to holders of Class A equity interests of a subsidiary         $ 0.5 $ 0.7 $ 1.1 $ 1.4          
Equity interests redeemed during the period             593,893