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New Accounting Guidance - Narrative (Details)
$ in Millions
Oct. 01, 2018
USD ($)
ASU 2016-01 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Adoption of new accounting guidance $ (8.0)
Investments [Member] | ASU 2016-01 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Adoption of new accounting guidance (21.8)
Assets [Member] | ASU 2014-09 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Adoption of new accounting guidance 9.1
Liabilities [Member] | ASU 2014-09 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Adoption of new accounting guidance 2.2
Retained Earnings [Member] | ASU 2016-01 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Adoption of new accounting guidance 29.8
Retained Earnings [Member] | ASU 2014-09 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Adoption of new accounting guidance (6.9)
Comprehensive Income [Member] | ASU 2016-01 [Member]  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Adoption of new accounting guidance $ (8.0)