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Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Jun. 25, 2019	Apr. 10, 2019	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 2,300.0	$ 2,300.0			$ 2,000.0
Maximum borrowing capacity, through 2020					1,300.0
Maximum borrowing capacity, through 2022	1,600.0	1,600.0			$ 1,200.0
Accordion feature, increase limit		250.0
Amounts borrowed under the credit facility	140.6	140.6					$ 0.0
Principal amount repurchased				$ 951.8
Gain (Loss) on Extinguishment of Debt	194.1	194.1	$ (19.0)
7.875% Senior Notes Due 2019
Debt Instrument [Line Items]
Long-term debt assumed	$ 201.4	$ 201.4
Debt instrument interest rate stated percentage	7.875%	7.875%
4.875% Senior Notes Due 2022
Debt Instrument [Line Items]
Long-term debt assumed	$ 620.8	$ 620.8
Debt instrument interest rate stated percentage	4.875%	4.875%				4.875%
4.75% Senior notes due 2024
Debt Instrument [Line Items]
Long-term debt assumed	$ 398.1	$ 398.1
Debt instrument interest rate stated percentage	4.75%	4.75%				4.75%
7.375% Senior notes due 2025
Debt Instrument [Line Items]
Long-term debt assumed	$ 500.0	$ 500.0
Debt instrument interest rate stated percentage	7.375%	7.375%				7.375%
5.40% Senior Notes Due 2042
Debt Instrument [Line Items]
Long-term debt assumed	$ 400.0	$ 400.0
Debt instrument interest rate stated percentage	5.40%	5.40%				5.40%
5.85% Senior Notes Due 2044
Debt Instrument [Line Items]
Long-term debt assumed	$ 400.0	$ 400.0
Debt instrument interest rate stated percentage	5.85%	5.85%				5.85%

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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- Definition

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

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Face (par) amount of the original debt instrument that was repurchased.

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Fair value of the amount outstanding under the credit facility.

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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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