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Financial Instruments and Risk Management (Derivative Notional Amounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Sep. 10, 2016
Foreign exchange contracts [Member] | Hedge [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount $ 159.8 $ 169.2 $ 161.4
Foreign exchange contracts [Member] | Non-hedge [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount 0.0 2.1 10.8
Interest rate swaps [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount 464.0 496.0 537.9
Cross currency swap [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount $ 106.4 $ 0.0 $ 0.0