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Debt - Other (Details) $ in Millions			1 Months Ended	3 Months Ended	9 Months Ended
	Apr. 12, 2013 USD ($)	Nov. 20, 2006 USD ($) tranche	Sep. 30, 2016 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) item	Dec. 31, 2018 USD ($)	Nov. 15, 2016 USD ($)
Debt
Total				$ 1,651.8	$ 1,651.8	$ 2,214.2
Number of financial covenants | item					2
Credit Agreement
Debt
Maximum borrowing capacity			$ 2,100.0
Debt term			5 years
Unsecured revolving credit facility due September 30, 2021
Debt
Maximum borrowing capacity			$ 1,500.0
Total				$ 408.0	$ 408.0	$ 925.0
Additional maximum borrowing capacity under the credit agreement subject to approval of the lenders and certain other conditions			500.0
Commitment fee on unused portion of revolving credit facility (as a percent)					0.125%
Weighted average fixed interest rate (as a percent)				3.20%	3.20%	3.86%
Letters of credit outstanding				$ 40.6	$ 40.6
Available on the revolving credit facility				1,050.0	$ 1,050.0
Unsecured revolving credit facility due September 30, 2021 | LIBOR
Debt
Variable interest rate					LIBOR
Interest rate added to base (as a percent)					1.00%
Unsecured revolving credit facility due September 30, 2021 | Bank prime rate
Debt
Variable interest rate					bank prime
Unsecured term loan due from December 31, 2019 to September 30, 2021
Debt
Total				$ 480.0	$ 480.0	$ 525.0
Debt amount			$ 600.0
Annual amortization of term loan thereafter until June 2021 (as a percent)			10.00%
Interest rate added to base rate adjustment (as a percent)				(0.25%)
Weighted average fixed interest rate (as a percent)				3.04%	3.04%	3.77%
Unsecured term loan due from December 31, 2019 to September 30, 2021 | LIBOR
Debt
Variable interest rate					LIBOR
Interest rate added to base (as a percent)					1.00%
Unsecured term loan due from December 31, 2019 to September 30, 2021 | Bank prime rate
Debt
Variable interest rate					bank prime
Senior Unsecured Notes
Debt
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating					101.00%
Senior unsecured notes issued November 20, 2006
Debt
Issuance of debt		$ 600.0
Number of tranches comprising the debt issuance | tranche		2
Senior unsecured notes due November 15, 2016
Debt
Total							$ 0.0
Interest rate (as a percent)		6.20%
Lump sum payment on maturity							$ 350.0
Issuance of debt		$ 350.0
Senior unsecured notes due April 15, 2023
Debt
Total				$ 500.0	$ 500.0	$ 500.0
Interest rate (as a percent)	4.50%
Issuance of debt	$ 500.0
Senior unsecured notes due November 15, 2036
Debt
Total				250.0	250.0	250.0
Interest rate (as a percent)		6.85%
Issuance of debt		$ 250.0
Other notes and revolving credit facilities
Debt
Maximum borrowing capacity				9.8	9.8
Total				4.6	4.6	4.7
IRB
Debt
Total				$ 9.2	$ 9.2	$ 9.5

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The contingent increase above the maximum borrowing capacity under the credit facility, if any one or more of the existing banks or new banks agree to provide such increased commitment amount.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average interest rate of debt outstanding.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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