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Debt - Notes Issued Under Indentures Narrative (Details)	1 Months Ended								3 Months Ended		12 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Nov. 30, 2017 GBP (£)	Sep. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	May 30, 2017 USD ($)	May 30, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2019 USD ($) debt_instrument	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 EUR (€) debt_instrument	Dec. 31, 2019 CAD ($) debt_instrument	Dec. 31, 2019 GBP (£) debt_instrument	Aug. 31, 2017 CAD ($)	May 31, 2017 EUR (€)
Debt Instrument [Line Items]
Number of series of subordinated notes | debt_instrument											10			10	10	10
Debt (inclusive of discount)											$ 8,751,544,000	$ 8,229,430,000
Long-term debt											8,664,579,000	8,142,823,000
Net proceeds from sales of senior notes											$ 987,500,000	0	$ 2,656,948,000
Redemption price, percentage											100.00%
Senior Notes 4.375 Percent due 2021
Debt Instrument [Line Items]
Principal Amount											$ 500,000,000
Stated interest rate (as a percent)											4.375%			4.375%	4.375%	4.375%
Debt (inclusive of discount)											$ 500,000,000	500,000,000
Long-term debt											497,564,000	495,845,000
Senior Notes 6 Percent Due 2023
Debt Instrument [Line Items]
Principal Amount											$ 600,000,000
Stated interest rate (as a percent)											6.00%			6.00%	6.00%	6.00%
Debt (inclusive of discount)											$ 600,000,000	600,000,000
Long-term debt											$ 595,973,000	594,874,000
CAD 5.375 Percent Senior Notes due 2023
Debt Instrument [Line Items]
Principal Amount															$ 250,000,000
Stated interest rate (as a percent)											5.375%			5.375%	5.375%	5.375%
Senior Notes 4.875 Percent due 2027
Debt Instrument [Line Items]
Principal Amount											$ 1,000,000,000
Stated interest rate (as a percent)											4.875%			4.875%	4.875%	4.875%
Debt (inclusive of discount)					$ 1,000,000,000					$ 1,000,000,000	$ 1,000,000,000	1,000,000,000
Long-term debt											$ 988,980,000	987,558,000
Net proceeds from sales of senior notes					987,500,000
Senior Subordinated Notes 5.75 Percent due 2024
Debt Instrument [Line Items]
Stated interest rate (as a percent)											5.75%			5.75%	5.75%	5.75%
Debt (inclusive of discount)											$ 1,000,000,000	1,000,000,000
Long-term debt											$ 993,591,000	992,218,000
Euro Notes 3 Percent due 2025
Debt Instrument [Line Items]
Principal Amount | €														€ 300,000,000
Stated interest rate (as a percent)											3.00%			3.00%	3.00%	3.00%
Debt (inclusive of discount) | €																		€ 300,000,000
Net proceeds from sales of senior notes							$ 332,683,000	€ 296,250,000
GBP Notes due 2025 3.875 Percent
Debt Instrument [Line Items]
Principal Amount | £																£ 400,000,000
Stated interest rate (as a percent)											3.875%			3.875%	3.875%	3.875%
Debt (inclusive of discount) | £				£ 400,000,000
Net proceeds from sales of senior notes			$ 522,077,000	£ 395,000,000
Par				100.00%
Senior Notes 5.375 Percent due 2026
Debt Instrument [Line Items]
Principal Amount											$ 250,000,000
Stated interest rate (as a percent)											5.375%			5.375%	5.375%	5.375%
Debt (inclusive of discount)											$ 250,000,000	250,000,000
Long-term debt											247,244,000	246,815,000
Senior Notes due 2028 5.25 Percent
Debt Instrument [Line Items]
Principal Amount											$ 825,000,000
Stated interest rate (as a percent)											5.25%			5.25%	5.25%	5.25%
Debt (inclusive of discount)		$ 825,000,000							$ 825,000,000				$ 825,000,000
Net proceeds from sales of senior notes		$ 814,688,000
Senior Notes 4.875 Percent due 2029
Debt Instrument [Line Items]
Principal Amount											$ 1,000,000,000
Stated interest rate (as a percent)											4.875%			4.875%	4.875%	4.875%
Debt (inclusive of discount)	$ 1,000,000,000										$ 1,000,000,000	0
Long-term debt											$ 985,896,000	$ 0
Net proceeds from sales of senior notes	$ 987,500,000
GBP Senior Notes 6.125% Due 2022
Debt Instrument [Line Items]
Redemption price, percentage			104.594%	104.594%
Aggregate principal amount outstanding									$ 30,056,000
CAD Notes
Debt Instrument [Line Items]
Long-term debt						$ 157,458,000											$ 200,000,000
Redemption price, percentage						103.063%
Aggregate principal amount outstanding										6,354,000
CAD 6 Percent Senior Notes Due 2020
Debt Instrument [Line Items]
Long-term debt					$ 1,000,000,000					1,000,000,000
Senior Notes 6 Percent Due 2020
Debt Instrument [Line Items]
Redemption price, percentage					103.155%
Aggregate principal amount outstanding										$ 41,738,000
Parent
Debt Instrument [Line Items]
Number of series of subordinated notes | debt_instrument											7			7	7	7
IM US Holdings
Debt Instrument [Line Items]
Number of series of subordinated notes | debt_instrument											1			1	1	1
Canada Company
Debt Instrument [Line Items]
Number of series of subordinated notes | debt_instrument											1			1	1	1
Iron Mountain Europe
Debt Instrument [Line Items]
Number of series of subordinated notes | debt_instrument											1			1	1	1

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