Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions |
3 Months Ended | ||
---|---|---|---|
Mar. 31, 2019
USD ($)
segment
|
Jan. 01, 2019
USD ($)
|
Dec. 31, 2018
USD ($)
|
|
Operating lease assets | $ 447.8 | $ 0.0 | |
Operating lease liabilities | $ 508.6 | ||
Number of reportable segments | segment | 1 | ||
Interest in subsidiary (less than given percentage) | 100.00% | ||
Accounting Standards Update 2016-02 | |||
Operating lease assets | $ 463.0 | ||
Operating lease liabilities | $ 526.0 |