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Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]      
Contract with Customer, Asset, Net, Current $ 3.5 $ 3.5 $ 4.0
Contract with Customer, Liability, Current 30.0 30.0 56.9
Contract with Customer, Liability, Noncurrent 9.7 9.7 $ 20.5
Change in Contract With Customer, Asset [Roll Forward]      
Contract with Customer, Asset, after Allowance for Credit Loss   4.0  
Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination 8.4    
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress   1.3  
Contract with Customer, Asset, Reclassified to Receivable   (10.2)  
Contract with Customer, Asset, after Allowance for Credit Loss 3.5 3.5  
Change in Contract With Customer, Liability [Roll Forward]      
Contract with Customer, Liability   77.4  
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination 5.3    
Contract with Customer, Liability, Increase from Cash Receipts   42.9  
Contract with Customer, Liability, Revenue Recognized, Included In Beginning Balance   (56.3)  
Contract with Customer, Liability, Revenue Recognized, Added During Period   (29.6)  
Contract with Customer, Liability $ 39.7 $ 39.7