Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Income Taxes (Details)

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Summary of Significant Accounting Policies - Income Taxes (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Income Taxes [Line Items]  
Total amount of unrecognized tax benefits relating to uncertain tax positions $ 38.8
Decrease in the total amount of unrecognized tax benefits relating to uncertain tax positions (2.3)
Maximum  
Income Taxes [Line Items]  
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months $ 5.9