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Long-term Debt - Interest Expense, Net (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]        
Interest expense $ (135.7) $ (135.0) $ (266.1) $ (267.6)
Interest income 0.2 0.3 0.4 0.6
Capitalized interest 0.5 0.0 0.9 0.0
Interest expense, net (135.0) $ (134.7) (264.8) $ (267.0)
2.75% Convertible Notes due 2026 | Convertible Notes        
Debt Instrument [Line Items]        
Coupon interest 1.2   1.2  
Amortization of debt discount 1.4   1.4  
Amortization of debt issuance costs 0.1   0.1  
Convertible Notes interest expense $ 2.7   $ 2.7