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New Accounting Guidance (Narratives) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Oct. 01, 2016
Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Excess tax benefits recognized under new accounting standard $ 7.0    
Accounting Standards Update 2015-03 [Member] | Other Noncurrent Assets [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities     $ (17.0)
Accounting Standards Update 2015-03 [Member] | Other Noncurrent Assets [Member] | Discontinued Operations [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities     (9.6)
Accounting Standards Update 2015-03 [Member] | Long-term Debt [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities     17.0
Accounting Standards Update 2015-03 [Member] | Long-term Debt [Member] | Discontinued Operations [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reclassification of debt issuance cost with (decrease) to assets and decrease to liabilities     $ 9.6
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] | Retained Earnings [Member]      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Cumulative-effect adjustment related to adoption of new accounting standard   $ 8.8