Accumulated Other Comprehensive Loss - Changes in Accumulated Other Comprehensive (Loss) by Component (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Jan. 01, 2019
AOCI Attributable to Parent [Roll Forward]
Beginning balance	$ 3,674,707
Other comprehensive loss before reclassifications	(201,913)	$ 16,749
Amounts reclassified from accumulated other comprehensive loss	9,892	30,868
Other comprehensive income (loss), net of income taxes	(192,021)	47,617
Ending balance	3,402,702
Pension and Other Post-Retirement Benefits
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(704,415)	(626,322)
Other comprehensive loss before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive loss	8,448	4,832
Other comprehensive income (loss), net of income taxes	8,448	4,832
Ending balance	(695,967)	(744,016)
Pension and Other Post-Retirement Benefits | Accounting Standards Update 2018-02
AOCI Attributable to Parent [Roll Forward]
Cumulative effect from adoption of ASU			$ (122,526)
Net Investment Hedge
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(20,671)	(4,631)
Other comprehensive loss before reclassifications	(19,300)	(4,178)
Amounts reclassified from accumulated other comprehensive loss	1,444	(1,001)
Other comprehensive income (loss), net of income taxes	(17,856)	(5,179)
Ending balance	(38,527)	(9,810)
Net Investment Hedge | Accounting Standards Update 2018-02
AOCI Attributable to Parent [Roll Forward]
Cumulative effect from adoption of ASU			0
Foreign Currency Translation
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(416,222)	(484,125)
Other comprehensive loss before reclassifications	(182,613)	20,927
Amounts reclassified from accumulated other comprehensive loss	0	27,037
Other comprehensive income (loss), net of income taxes	(182,613)	47,964
Ending balance	(598,835)	(436,161)
Foreign Currency Translation | Accounting Standards Update 2018-02
AOCI Attributable to Parent [Roll Forward]
Cumulative effect from adoption of ASU			0
Total
AOCI Attributable to Parent [Roll Forward]
Beginning balance	(1,141,308)	(1,115,078)
Ending balance	$ (1,333,329)	$ (1,189,987)
Total | Accounting Standards Update 2018-02
AOCI Attributable to Parent [Roll Forward]
Cumulative effect from adoption of ASU			$ (122,526)