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Fair Value Measurements - Table 2 (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Revolving Credit Facility [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 138.0	$ 152.0
Revolving Credit Facility [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	138.0	152.0
Letters of Credit [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	0.0	0.0
Letters of Credit [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	35.4	33.3
Term Loan Facilities [Member] | Term Loan Facilities [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	298.3	421.2
Term Loan Facilities [Member] | Term Loan Facilities [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 300.0	422.5
Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument interest rate (percent)	5.125%
Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 295.7	295.3
Senior Notes [Member] | 5.125% Senior Notes Due 2023 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 310.0	297.8
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument interest rate (percent)	5.75%
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 1,193.7	1,193.2
Senior Notes [Member] | 5.75% Senior Notes Due 2024 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 1,231.5	1,216.6
Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument interest rate (percent)	5.75%
Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 344.3	343.9
Senior Notes [Member] | 5.75% Senior Notes Due 2025 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 365.8	349.6
Senior Subordinated Notes [Member] | 2.00% Convertible Senior Subordinated Notes due 2043 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument interest rate (percent)	2.00%
Senior Subordinated Notes [Member] | 2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 0.0	275.7
Senior Subordinated Notes [Member] | 2.00% Convertible Senior Subordinated Notes due 2043 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	0.0	382.6
Other Notes Payable [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	80.1	55.8
Other Notes Payable [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying amounts and estimated fair values of financial instruments	$ 80.1	$ 55.8

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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