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Debt - Narrative (Details) - Line of Credit Facility - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 19, 2019
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Aug. 05, 2019
Line of Credit Facility [Line Items]              
Derivative, Variable Interest Rate   2.40%   2.40%      
Interest rate cash flow hedge liability at fair value   $ 5.2   $ 5.2      
Derivative liability           $ 2.4  
Fair Value, Inputs, Level 2              
Line of Credit Facility [Line Items]              
Interest rate cash flow hedge liability at fair value   5.2   5.2   $ 2.4  
Interest Rate Swap              
Line of Credit Facility [Line Items]              
Derivative liability, notional amount   $ 200.0   $ 200.0      
Derivative, fixed interest rate   2.70%   2.70%      
Debt instrument, description of variable rate basis       one-month LIBOR      
Maximum | Interest Rate Swap              
Line of Credit Facility [Line Items]              
Derivative, maturity date       Jun. 30, 2022      
Revolving credit facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   $ 430.0   $ 430.0      
Credit facility, expiration date       Mar. 16, 2022   Mar. 16, 2022  
Commitment fee for unused commitments   0.3 $ 0.3 $ 0.7 $ 0.6    
Revolving credit facility | Long-term debt              
Line of Credit Facility [Line Items]              
Credit facility, outstanding amount   0.0   0.0      
Revolving credit facility | Long-term debt | Subsequent Event              
Line of Credit Facility [Line Items]              
Credit facility, outstanding amount             $ 40.0
Line of Credit Facility, Interest Rate at Period End             4.40%
Letter of credit sublimit to revolving credit facility              
Line of Credit Facility [Line Items]              
Letters of credit outstanding, amount   66.0   66.0      
Letter of credit              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   150.0   150.0      
Letters of credit outstanding, amount   143.0   143.0      
AR Facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   100.0   $ 100.0      
Credit facility, expiration date       Jun. 30, 2021      
AR Facility | Subsequent Event              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 125.0            
Credit facility, expiration date Jun. 30, 2022            
AR Facility | Short-term debt              
Line of Credit Facility [Line Items]              
Credit facility, outstanding amount   0.0   $ 0.0   $ 85.0  
Line of credit facility, remaining borrowing capacity   100.0   100.0      
AR Facility | Short-term debt | Subsequent Event              
Line of Credit Facility [Line Items]              
Credit facility, outstanding amount             $ 85.0
Short-term Debt, Weighted Average Interest Rate, at Point in Time             3.30%
Repurchase facility              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity   75.0   $ 75.0      
Credit facility, expiration date       Sep. 06, 2019      
Repurchase facility | Subsequent Event              
Line of Credit Facility [Line Items]              
Maximum borrowing capacity $ 90.0            
Credit facility, expiration date Jun. 30, 2020            
Repurchase facility | Short-term debt              
Line of Credit Facility [Line Items]              
Credit facility, outstanding amount   0.0   $ 0.0   $ 75.0  
Line of credit facility, remaining borrowing capacity   75.0   75.0      
Repurchase facility | Short-term debt | Subsequent Event              
Line of Credit Facility [Line Items]              
Credit facility, outstanding amount             $ 75.0
Short-term Debt, Weighted Average Interest Rate, at Point in Time             3.50%
AR securitization facilities | Maximum              
Line of Credit Facility [Line Items]              
Debt instrument, collateral amount   $ 230.5   $ 230.5