Financing (Components Of Debt) (Detail)		1 Months Ended		6 Months Ended	12 Months Ended
	Jan. 10, 2018 EUR (€)	Jan. 31, 2018 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2018 EUR (€)	Feb. 05, 2018 USD ($)
Debt Instrument [Line Items]
Long-term Commercial Paper				$ 171,400,000	$ 0
Debt Instrument, Basis Spread on Variable Rate				5.00%
Long-term debt				$ 937,100,000	494,100,000
Short-term Debt				$ 171,400,000	$ 249,400,000
Four Point Four Five Percent Notes Due Two Thousand And Twenty Three [Member]
Debt Instrument [Line Items]
Maturity Year Of Debt Instrument				2023
Debt Instrument, Interest Rate, Stated Percentage				4.45%	4.45%	4.45%
2.75% Notes Due 2018
Debt Instrument [Line Items]
Notes Issued			$ 250,000,000
Debt Instrument, Interest Rate, Stated Percentage					2.75%
Debt Instrument, Face Amount					$ 250,000,000
Other Debt [Member] [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs					(600,000)
Six Point Five Five Percent Notes Due 2036 [Member]
Debt Instrument [Line Items]
Long-term Debt				$ 198,200,000	198,100,000
Four Point Four Five Percent Notes Due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt				$ 298,500,000	$ 298,400,000
6.55% Notes Due 2036
Debt Instrument [Line Items]
Maturity Year Of Debt Instrument				2036
Debt Instrument, Interest Rate, Stated Percentage				6.55%	6.55%	6.55%
Building Loan Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €	€ 22,000,000					€ 22,000,000
Line of Credit Facility, Maximum Borrowing Capacity | €	27,000,000
Line of Credit Facility, Periodic Payment | €	€ 400,000
Line of Credit Facility, Interest Rate During Period	1.50%
Senior Notes [Member] | Senior Notes Due 2048 [Member]
Debt Instrument [Line Items]
Long-term Debt				$ 345,900,000	$ 0
Debt Instrument, Interest Rate, Stated Percentage							4.20%
Debt Instrument, Face Amount							$ 350,000,000
Line of Credit [Member]
Debt Instrument [Line Items]
Amortization of Debt Issuance Costs				(2,000,000)	$ (2,400,000)
Line of Credit [Member] | 364 Day Credit Agreement [Member]
Debt Instrument [Line Items]
Proceeds from Lines of Credit		$ 100,000,000
Line of Credit [Member] | Line of Credit [Member] | 3 Year Term Loan Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt				70,800,000
Proceeds from Lines of Credit		$ 200,000,000
Debt term		3 years
Line of Credit [Member] | Line of Credit [Member] | Syndicated Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt				$ 25,700,000
Crane Currency Malta [Member] | Syndicated Loan Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €	€ 59,000,000					62,000,000
Line of Credit Facility, Maximum Borrowing Capacity | €	€ 72,000,000
Credit Facility, Debt Service Cover Ratio	1.2
Credit Facility, Debt-To-Equity Ratio	2.5
Credit Facility, Debt-To-Equity Ratio Max	1.5
Crane Currency Malta [Member] | Syndicated Loan Facility One [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €						49,000,000
Line of Credit Facility, Maximum Borrowing Capacity | €	€ 49,000,000
Line of Credit Facility, Periodic Payment | €	300,000
Crane Currency Malta [Member] | Syndicated Loan Facility Two [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | €						€ 13,000,000
Line of Credit Facility, Maximum Borrowing Capacity | €	23,000,000
Line of Credit Facility, Periodic Payment | €	€ 100,000
EURIBOR | Crane Currency Malta [Member] | Syndicated Loan Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%