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Segment Reporting - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]    
Document Period End Date Sep. 30, 2019  
Total assets for reportable segments $ 6,386.8 [1] $ 5,175.0
Reclassification of noncurrent deferred income tax liabilities to net noncurrent deferred income tax assets (33.5) (40.5)
Total assets 6,386.8 [1] 5,175.0
Operating Segments [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Total assets for reportable segments 6,420.3 5,215.5
Total assets $ 6,420.3 $ 5,215.5
[1]
Our consolidated assets as of September 30, 2019 and December 31, 2018 include total assets of variable interest entities of $220.9 million and $197.5 million, respectively, which cannot be used by us to settle the obligations of other entities. Our consolidated liabilities as of September 30, 2019 and December 31, 2018 include total liabilities of the variable interest entities of $49.6 million and $50.8 million, respectively. See Note 3, Variable Interest Entities.