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Debt (Senior Secured Credit Facility) (Narrative) (Details)
1 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Debt Instrument [Line Items]          
Line of credit facility, term loan, proceeds received       $ 1,153,230,000 $ 684,287,000
Credit Facility [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 1,500,000,000 $ 1,200,000,000   $ 1,500,000,000  
Line of credit facility, maturity date       Feb. 22, 2022  
Line of credit facility, description of variable rate       Outstanding revolving loans and the term loan under the Credit Facility bear interest, at the Company’s option, at a rate equal to either (a) a Eurocurrency Rate, as defined in the 2017 Credit Facility, plus a margin of 1.25% to 2.00% (under the 2016 Credit Facility, the margin was from 1.00% to 2.00%), or (b) a Base Rate, as defined in the 2017 Credit Facility, plus a margin of 0.25% to 1.00% (under the 2016 Credit Facility, the margin was from 0.00% to 1.00%). The Base Rate equals the highest of (i) the Federal Funds Rate, as defined in the Credit Facility, plus 0.50%, (ii) Bank of America’s prime rate, and (iii) the Eurocurrency Rate plus 1.00%.  
Line of credit facility, commitment fee description       The Company must also pay a commitment fee to the lenders of 0.20% to 0.40% on any unused availability under the Credit Facility.  
Line of credit facility, letters of credit issued 305,600,000 $ 314,300,000   $ 305,600,000  
Line of credit facility, remaining borrowing capacity $ 379,800,000     $ 379,800,000  
Line of credit facility, unused facility fee (percentage) 0.25% 0.40%      
Line of credit facility, collateral       The Credit Facility is guaranteed by certain subsidiaries of the Company (the “Guarantor Subsidiaries”) and the obligations under the Credit Facility are secured by substantially all of the Company’s and the Guarantor Subsidiaries’ respective assets, subject to certain exceptions.  
Line of credit facility, covenant terms       The Credit Facility requires that the Company maintain a Maximum Consolidated Leverage Ratio, as defined in the Credit Facility, of 3.50 (subject to the Acquisition Adjustment described below). The Credit Facility also requires that the Company maintain a Minimum Consolidated Interest Coverage Ratio, as defined in the Credit Facility, of 3.00. The Credit Facility provides that, for purposes of calculating the Consolidated Leverage Ratio, certain cash charges may be added back to the calculation of Consolidated EBITDA, as defined in the Credit Facility, and funded indebtedness excludes undrawn standby performance letters of credit. Additionally, notwithstanding the terms discussed above, subject to certain conditions, if a permitted acquisition or series of permitted acquisitions having consideration exceeding $50 million occurs during a fiscal quarter, the Consolidated Leverage Ratio may be temporarily increased to up to 3.75 during such fiscal quarter and the subsequent two fiscal quarters. Such right may be exercised no more than two times during the term of the Credit Facility. Subject to customary exceptions, the Credit Facility limits the borrowers’ and the Guarantor Subsidiaries’ ability to engage in certain activities, including acquisitions, mergers and consolidations, debt incurrence, investments, capital expenditures, asset sales, debt prepayments, lien incurrence and the making of distributions or repurchases of capital stock. However, distributions payable solely in capital stock are permitted. The Credit Facility provides for customary events of default and carries cross-default provisions with the Company’s other significant debt instruments, including the Company’s indemnity agreement with its surety provider, as well as customary remedies, including the acceleration of repayment of outstanding amounts and other remedies with respect to the collateral securing the Credit Facility obligations.  
Credit Facility [Member] | Plan [Member]          
Debt Instrument [Line Items]          
Line of credit facility, adjusted consolidated leverage ratio, permitted acquisitions amount, minimum threshold       $ 50,000,000  
Credit Facility [Member] | Eurocurrency Rate [Member] | Base Rate Option (iii) [Member]          
Debt Instrument [Line Items]          
Line of credit facility, variable interest rate, margin over base rate (percentage)       1.00%  
Credit Facility [Member] | Federal Funds Rate [Member] | Base Rate Option (i) [Member]          
Debt Instrument [Line Items]          
Line of credit facility, variable interest rate, margin over base rate (percentage)       0.50%  
Credit Facility [Member] | Bank of America Prime Rate [Member] | Base Rate Option (ii) [Member]          
Debt Instrument [Line Items]          
Line of credit facility, variable interest rate, margin over base rate (percentage)       0.00%  
Credit Facility [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, revolving loan sublimit, Canadian dollars or Mexican pesos $ 300,000,000     $ 300,000,000  
Line of credit facility, unused facility fee (percentage) 0.40% 0.40%      
Line of credit facility, required consolidated leverage ratio (in multiple) 3.50     3.50  
Credit Facility [Member] | Maximum [Member] | Plan [Member] | Permitted Acquisition [Member]          
Debt Instrument [Line Items]          
Line of credit facility, required consolidated leverage ratio (in multiple) 3.75     3.75  
Line of credit facility, adjusted consolidated leverage ratio, permitted acquisitions, maximum number of times right may be exercised 2     2  
Credit Facility [Member] | Maximum [Member] | Eurocurrency Rate [Member]          
Debt Instrument [Line Items]          
Line of credit facility, variable interest rate, margin over base rate (percentage) 2.00% 2.00%      
Credit Facility [Member] | Maximum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Line of credit facility, variable interest rate, margin over base rate (percentage) 1.00% 1.00%      
Credit Facility [Member] | Minimum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, unused facility fee (percentage) 0.20% 0.20%      
Line of credit facility, required consolidated interest coverage ratio (in multiple) 3.0     3.0  
Credit Facility [Member] | Minimum [Member] | Eurocurrency Rate [Member]          
Debt Instrument [Line Items]          
Line of credit facility, variable interest rate, margin over base rate (percentage) 1.25% 1.00%      
Credit Facility [Member] | Minimum [Member] | Base Rate [Member]          
Debt Instrument [Line Items]          
Line of credit facility, variable interest rate, margin over base rate (percentage) 0.25% 0.00%      
Credit Facility [Member] | Revolving Loans [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 1,100,000,000     $ 1,100,000,000  
Long-term debt obligations 564,600,000 $ 279,900,000   564,600,000  
Line of credit facility, amount of borrowings denominated in foreign currencies 153,000,000 119,000,000   153,000,000  
Line of credit facility, remaining borrowing capacity 229,800,000 405,900,000   229,800,000  
Line of credit facility, remaining borrowing capacity available in either Canadian dollars or Mexican pesos $ 147,400,000 $ 80,900,000   $ 147,400,000  
Credit Facility [Member] | Revolving Loans [Member] | Weighted Average [Member]          
Debt Instrument [Line Items]          
Line of credit facility, interest rate (percentage) 3.60% 3.71%   3.60%  
Credit Facility [Member] | Term Loan [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 400,000,000     $ 400,000,000  
Long-term debt obligations $ 250,000,000 $ 237,500,000   $ 250,000,000  
Line of credit facility, interest rate (percentage) 2.73% 2.77%   2.73%  
Line of credit facility, remaining borrowing capacity $ 150,000,000     $ 150,000,000  
Credit Facility [Member] | Term Loan [Member] | Plan [Member]          
Debt Instrument [Line Items]          
Line of credit facility, term loan, frequency of payments       quarterly  
Line of credit facility, term loan, amount of quarterly principal installment payments       $ 3,100,000  
Credit Facility [Member] | Term Loan [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Line of credit facility, term loan, proceeds received     $ 150,000,000    
Credit Facility [Member] | Letters of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit facility, capacity available for letters of credit $ 229,800,000 $ 335,700,000   $ 229,800,000  
Line of credit facility, interest rate description, letters of credit       Financial standby letters of credit and commercial letters of credit issued under the 2017 Credit Facility are subject to a letter of credit fee of 1.25% to 2.00% (under the 2016 Credit Facility, the letter of credit fee was from 1.00% to 2.00%), and performance standby letters of credit are subject to a letter of credit fee of 0.50% to 1.00% under the Credit Facility.  
Credit Facility [Member] | Letters of Credit [Member] | Financial Standby [Member]          
Debt Instrument [Line Items]          
Line of credit facility, interest rate (percentage) 1.50% 2.00%   1.50%  
Credit Facility [Member] | Letters of Credit [Member] | Performance Standby [Member]          
Debt Instrument [Line Items]          
Line of credit facility, interest rate (percentage) 0.625% 1.00%   0.625%  
Credit Facility [Member] | Letters of Credit [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, capacity available for letters of credit $ 650,000,000     $ 650,000,000  
Line of credit facility, capacity available for letters of credit sublimit, Canadian dollars or Mexican pesos $ 200,000,000     $ 200,000,000  
Credit Facility [Member] | Letters of Credit [Member] | Maximum [Member] | Financial Standby [Member]          
Debt Instrument [Line Items]          
Line of credit facility, interest rate (percentage) 2.00% 2.00%   2.00%  
Credit Facility [Member] | Letters of Credit [Member] | Maximum [Member] | Performance Standby [Member]          
Debt Instrument [Line Items]          
Line of credit facility, interest rate (percentage) 1.00% 1.00%   1.00%  
Credit Facility [Member] | Letters of Credit [Member] | Minimum [Member] | Financial Standby [Member]          
Debt Instrument [Line Items]          
Line of credit facility, interest rate (percentage) 1.25% 1.00%   1.25%  
Credit Facility [Member] | Letters of Credit [Member] | Minimum [Member] | Performance Standby [Member]          
Debt Instrument [Line Items]          
Line of credit facility, interest rate (percentage) 0.50% 0.50%   0.50%  
Credit Facility [Member] | Swing Line Loans [Member] | Maximum [Member]          
Debt Instrument [Line Items]          
Line of credit facility, swing line loans sublimit $ 75,000,000     $ 75,000,000  
Credit Facility [Member] | Accordion Feature [Member] | Plan [Member]          
Debt Instrument [Line Items]          
Line of credit facility, maximum borrowing capacity $ 250,000,000     $ 250,000,000