Accumulated Other Comprehensive Loss (Components of AOCI) (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ (379,141,000) [1] $ (220,295,000) [1]    
Other comprehensive (loss) income before reclassifications (109,286,000) [1] (2,187,000) [1]    
Amounts reclassified from AOCL 5,597,000 [1] 8,085,000 [1]    
Net current-period other comprehensive (loss) income (103,689,000) [1] 5,898,000 [1]    
Ending balance (482,830,000) [1] (214,397,000) [1]    
Interest Rate Cash Flow Hedge Loss to be Reclassified During Next 12 Months, Net 7,100,000      
Accumulated Other Comprehensive Income (Loss), accumulated Net Gain (Loss) from Net investment hedge 2,100,000      
Noncontrolling Interest [Member]        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax (1,300,000) 1,400,000 1,300,000 1,200,000
Foreign currency translation items [Member]        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (238,533,000) [1] (89,953,000) [1]    
Other comprehensive (loss) income before reclassifications (106,434,000) [1] (2,509,000) [1]    
Amounts reclassified from AOCL 0 [1] 5,460,000 [1]    
Net current-period other comprehensive (loss) income (106,434,000) [1] 2,951,000 [1]    
Ending balance (344,967,000) [1] (87,002,000) [1]    
Pension and other postretirement effects [Member]        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (135,398,000) (129,528,000)    
Other comprehensive (loss) income before reclassifications 5,501,000 298,000    
Amounts reclassified from AOCL 2,390,000 2,481,000    
Net current-period other comprehensive (loss) income 7,891,000 2,779,000    
Ending balance (127,507,000) (126,749,000)    
Cash flow hedging activity [Member]        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance (5,210,000) (814,000)    
Other comprehensive (loss) income before reclassifications (8,353,000) 24,000    
Amounts reclassified from AOCL 3,207,000 144,000    
Net current-period other comprehensive (loss) income (5,146,000) 168,000    
Ending balance $ (10,356,000) $ (646,000)    
[1] Includes foreign currency translation adjustments attributable to noncontrolling interests of $1.3 million and $1.2 million at January 1, 2015 and 2014 and $1.3 million and $1.4 million at March 31, 2015 and 2014. Includes accumulated net investment hedge losses of $2.1 million, net of deferred taxes, at March 31, 2015. Amounts in parentheses indicate debits.