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Financial Instruments and Risk Management (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jan. 31, 2013
Mar. 31, 2012
Total exposure to floating rate interest rates 2.00% 5.00%      
Unrealized gains on interest-rate swap agreements $ 58.1 $ 79.4      
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments 0.0 0.0 $ (0.7)    
Hedge loss reclassified to interest expense 120.5 108.8 $ 117.9    
Net losses on derivative hedges expected to be reclassified from AOCI to earnings 1.9        
Loss written-off resulting from non-performance of counterparties 1.2        
Foreign Exchange Contract [Member]          
Notional amounts of derivative contracts 127.9        
Gain (Loss) in other expense from undesignated foreign currency exchange contracts (2.7) (14.9)      
2007 Lock Agreement [Member]          
Notional amounts of derivative contracts 500.0        
Hedge loss reclassified to interest expense 38.0        
2007 Lock Agreement [Member] | 2013 Notes [Member]          
Principal amount of debt 250.0        
2007 Lock Agreement [Member] | 2018 Notes [Member]          
Principal amount of debt 250.0        
Intercompany Loans [Member]          
Gain (Loss) related to intercompany transactions for foreign currency change (2.5) 16.6      
Losses Amortized to Interest Expense in Five Years [Member] | 2007 Lock Agreement [Member]          
Hedge loss reclassified to interest expense 19.2        
Losses Amortized to Interest Expense in Ten Years [Member] | 2007 Lock Agreement [Member]          
Hedge loss reclassified to interest expense 18.8        
January 2013 Interest-Rate Swap Termination [Member]          
Notional Amount Related to Discontinuation of Interest Rate Fair Value Hedge       $ 1,000.0  
Unrealized gains on interest-rate swap agreements 35.4     90.4  
Interest Rate Swap Termination Fee       $ 2.3  
Amortization of Deferred Hedge Gains 14.6 14.4      
March 2012 Interest-Rate Swap Termination [Member]          
Notional Amount Related to Discontinuation of Interest Rate Fair Value Hedge         $ 350.0
Unrealized gains on interest-rate swap agreements 22.8       46.1
Interest Rate Swap Termination Fee         $ 2.5
Amortization of Deferred Hedge Gains $ 6.6 $ 6.3