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Debt - Notes Issued Under Indentures Narrative (Details)	1 Months Ended									3 Months Ended			12 Months Ended
	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Nov. 30, 2017 GBP (£)	Sep. 30, 2017 USD ($)	Aug. 31, 2017 USD ($)	May 30, 2017 USD ($)	May 30, 2017 EUR (€)	Sep. 30, 2016 USD ($)	Sep. 30, 2016 CAD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2018 USD ($) debt_instrument	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2018 EUR (€) debt_instrument	Dec. 31, 2018 GBP (£) debt_instrument	Dec. 31, 2018 CAD ($) debt_instrument	Aug. 31, 2017 CAD ($)	May 31, 2017 EUR (€)	May 31, 2016 USD ($)
Debt Instrument [Line Items]
Number of series of subordinated notes | debt_instrument													9			9	9	9
Debt (inclusive of discount)	$ 7,129,511,000									$ 7,129,511,000			$ 8,229,430,000	$ 7,129,511,000
Net proceeds from sales of senior notes													0	2,656,948,000	$ 925,443,000
Long-term debt	7,043,271,000									7,043,271,000			$ 8,142,823,000	7,043,271,000
Redemption price, percentage													100.00%
Repurchase price in the event of change of control, percentage of principal plus accrued and unpaid interest													101.00%			101.00%	101.00%	101.00%
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			$ 500,000,000	500,000,000							$ 500,000,000
Long-term debt	494,126,000									494,126,000			495,845,000	494,126,000
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			$ 600,000,000	600,000,000
Long-term debt	593,776,000									593,776,000			$ 594,874,000	593,776,000
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%
Debt (inclusive of discount)	199,171,000								$ 250,000,000	199,171,000			$ 183,403,000	199,171,000
Net proceeds from sales of senior notes								$ 186,693,000	$ 246,250,000
Long-term debt	195,876,000									195,876,000			180,897,000	195,876,000
Senior Subordinated Notes 5.75 Percent due 2024
Debt Instrument [Line Items]
Principal Amount													$ 1,000,000,000
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			$ 1,000,000,000	1,000,000,000
Long-term debt	990,844,000									990,844,000			$ 992,218,000	990,844,000
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)	359,386,000									359,386,000			$ 343,347,000	359,386,000						€ 300,000,000
Net proceeds from sales of senior notes						$ 332,683,000	€ 296,250,000
Long-term debt	354,695,000									354,695,000			$ 339,249,000	354,695,000
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)	539,702,000		£ 400,000,000							539,702,000			$ 509,425,000	539,702,000
Par			100.00%
Net proceeds from sales of senior notes		$ 522,077,000	£ 395,000,000
Long-term debt	531,984,000									531,984,000			502,852,000	531,984,000
Gbp Senior Notes 6.125 Percent Due 2022
Debt Instrument [Line Items]
Redemption price, percentage		104.594%	104.594%
Aggregate principal amount outstanding										30,056,000
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			$ 250,000,000	250,000,000							$ 250,000,000
Long-term debt	246,385,000									246,385,000			$ 246,815,000	246,385,000
Senior Notes 4.875 Percent due 2027
Debt Instrument [Line Items]
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		$ 1,000,000,000	1,000,000,000
Net proceeds from sales of senior notes				987,500,000
Long-term debt	986,134,000									986,134,000			987,558,000	986,134,000
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	825,000,000
Net proceeds from sales of senior notes	814,688,000
Long-term debt	$ 813,183,000									$ 813,183,000			$ 814,077,000	$ 813,183,000
Senior Notes 5.375 Percent due 2026 & 4.375 Percent due 2021
Debt Instrument [Line Items]
Net proceeds from sales of senior notes												$ 738,750,000
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 [Member]
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													6			6	6	6
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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